Thunderbird
Monthly
Thunderbird's remote attachment allowlist control (`mail.allowed_attachment_hostnames`) can be bypassed due to insufficient regex escaping of configured hostname values, allowing attacker-controlled servers to serve remote attachments that the filter was intended to block. Affected are all Thunderbird releases prior to 155 and 153.2; because hostname strings containing dots and other regex metacharacters are interpolated directly into a regular expression without sanitization, a crafted attachment hostname can pattern-match an allowlisted domain without being that domain. No public exploit has been identified at time of analysis, and EPSS sits at 0.15% (4th percentile), consistent with low-urgency real-world exploitation risk.
Heap memory disclosure in Mozilla Thunderbird's IMAP client allows a malicious IMAP server to trigger a use-after-free by sending a crafted ID extension response, leaking heap contents that are subsequently persisted to the user's prefs.js file on disk. All Thunderbird releases prior to 155, 140.15 (ESR), and 153.2 across three active release channels are affected. No public exploit or active exploitation has been identified at time of analysis; the EPSS score of 0.15% (4th percentile) reflects low current exploitation probability.
Thunderbird's mail header parser triggers a one-byte buffer over-read (CWE-126) when processing a maliciously crafted message header, potentially exposing a single byte of adjacent heap memory to the sender. All Thunderbird versions across three active release branches are affected until patched - 155, 140.15, and 153.2. No public exploit has been identified and EPSS sits at the 4th percentile, but the network-accessible attack path with no user interaction required keeps this relevant for unpatched deployments.
Use of uninitialized memory in Mozilla Thunderbird's MIME parser allows a remote attacker who sends a specially crafted email to trigger an error condition in certain MIME bodies, causing the client to read uninitialized memory. Depending on what previously occupied that memory, this can leak sensitive process data or crash the application. The flaw was fixed in Thunderbird 155, 140.15 ESR, and 153.2; no public exploit has been identified and EPSS exploitation probability is low (0.15%, 4th percentile).
Arbitrary code execution in Mozilla Thunderbird before 154 (and before ESR 153.2) on Windows allows a crafted calendar (iCalendar) invitation to attach a file:// URI that points at a local or network-hosted executable, bypassing Thunderbird's normal blocking of executable attachments. When the new invitation display is enabled the attachment can also be shown under a misleading, benign-looking filename. No active exploitation is confirmed (not in CISA KEV) and no public exploit code has been identified; EPSS is low at 0.15% (5th percentile).
Buffer over-read when forwarding messages in Thunderbird allows remote attackers to crash the application by triggering an off-by-one error in MIME header parsing, with a possible but limited information leak of one byte. Affected versions are prior to 153 and 140.13; the user must have the non-default 'view all headers' option enabled while forwarding a specifically crafted email. At time of analysis, there is no evidence of active exploitation (not listed in CISA KEV) and EPSS indicates very low exploitation likelihood.
Thunderbird's mail parser fails to validate string length parameters, allowing a compromised mail server to trigger out-of-bounds memory reads through malformed email content. Affected users running versions prior to 149 and 140.9 could experience application crashes or disclosure of sensitive data from process memory. The vulnerability requires network access but no user interaction, though no patch is currently available.
Memory safety bugs in Firefox 147 and Thunderbird 147 with evidence of memory corruption. Mainline-only bugs not present in ESR branches.
Use-after-free in Firefox DOM Core & HTML before 148. DOM object lifecycle error.
A use-after-free vulnerability in Firefox and Thunderbird's DOM processing allows remote attackers to execute arbitrary code through a malicious webpage or email attachment, requiring only user interaction to trigger. This affects Firefox versions below 148 and Thunderbird versions below 148, with no patch currently available.
Use-after-free in Firefox JavaScript GC before 148. Second GC UAF, different from CVE-2026-2795.
JIT miscompilation in Firefox WebAssembly before 148. The JIT compiler generates incorrect Wasm code, enabling type confusion. PoC available.
Use-after-free in Firefox JavaScript GC component before 148. GC-specific UAF affecting only mainline Firefox and Thunderbird.
Memory safety bugs in Firefox ESR 115.32, ESR 140.7, and Firefox 147. Broader set of memory corruption issues than CVE-2026-2792.
Memory safety bugs in Firefox ESR 140.7 and Firefox 147 with evidence of memory corruption and potential code execution exploitability.
Sandbox escape via DOM Core & HTML component in Firefox before 148. CVSS 10.0 — fifth sandbox escape in this release.
Privilege escalation in Firefox Messaging System component before 148. The inter-process messaging system allows escalation from content to privileged process.
Sandbox escape via Telemetry component in Firefox external software before 148. CVSS 10.0 — fourth sandbox escape in this release, through the telemetry subsystem.
HTML parser mitigation bypass in Firefox DOM before 148. Bypasses content sanitization protections via alternate authentication path in the HTML parser.
Integer overflow in Firefox Audio/Video component before 148. Overflow in media processing leads to incorrect memory allocations.
Boundary error in Firefox Web Audio component before 148. Crafted audio processing triggers memory corruption.
Use-after-free in Firefox Audio/Video Playback component before 148. Media playback triggers memory corruption.
Undefined behavior in Firefox DOM Core & HTML component before 148. Can lead to memory corruption and potential code execution.
Use-after-free in Firefox DOM Bindings (WebIDL) component before 148. Memory corruption in the interface between JavaScript and native DOM objects.
A use-after-free vulnerability in the IndexedDB storage component of Firefox and Thunderbird allows remote attackers to achieve arbitrary code execution through user interaction. Affected versions include Firefox below 148, Firefox ESR below 115.33 and 140.8, and Thunderbird below 148 and 140.8. No patch is currently available for this high-severity flaw.
Sandbox escape via IndexedDB in Firefox before 148 and Thunderbird. CVSS 10.0 — the Storage: IndexedDB component allows escaping the content process sandbox.
Use-after-free in Firefox JavaScript WebAssembly component before 148. WebAssembly-specific memory management bug.
Use-after-free in Firefox JavaScript JIT compiler before 148. Second JIT-related UAF in this release, different from CVE-2026-2764.
Use-after-free in Firefox JavaScript Engine before 148 and Thunderbird ESR 140.8. Separate UAF from CVE-2026-2763 and CVE-2026-2758.
JIT miscompilation causing use-after-free in Firefox JavaScript JIT compiler before 148. JIT bugs are highly exploitable due to their deterministic nature.
Use-after-free in Firefox JavaScript Engine before 148. One of multiple JS engine UAFs fixed in this release.
Integer overflow in Firefox JavaScript Standard Library before 148 leads to memory corruption through crafted JavaScript operations.
Second sandbox escape in Firefox WebRender component. CVSS 10.0 — independent path from CVE-2026-2760 to escape the content process sandbox.
Sandbox escape via boundary violation in Firefox WebRender graphics component. CVSS 10.0 — allows escaping the content sandbox to execute code with elevated privileges.
Boundary violation in Firefox ImageLib graphics component before 148 enables memory corruption through crafted images.
Use-after-free in Firefox JavaScript garbage collector before 148 allows remote code execution through crafted JavaScript.
Boundary violation in Firefox WebRTC Audio/Video component before 148 allows remote code execution through crafted WebRTC media streams.
Heap buffer overflow in libvpx affects Firefox and Thunderbird across multiple versions, enabling remote code execution when a user interacts with malicious content. An unauthenticated attacker can exploit this vulnerability over the network without special privileges to achieve complete system compromise including data theft and integrity violations. No patch is currently available, making this a critical risk for affected users.
Arbitrary code execution in Firefox and Thunderbird versions prior to 147/140.7 results from memory corruption vulnerabilities that could allow remote attackers to execute malicious code with no user interaction required. Multiple memory safety flaws across Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146, and Thunderbird 146 create conditions for potential exploitation despite no patch currently being available. The high CVSS score of 8.1 reflects the critical nature of achieving full system compromise through network-based attack vectors.
A use-after-free vulnerability in the IPC component of Firefox (versions below 147 and ESR versions below 115.32/140.7) and Thunderbird (versions below 147 and 140.7) enables remote code execution when users interact with malicious content. The flaw requires user interaction and network access, allowing attackers to achieve full system compromise with high integrity and confidentiality impact. No patch is currently available for this vulnerability.
Firefox Messaging System component has a sandbox escape vulnerability. Maximum CVSS 10.0 with scope change. Affects Firefox < 147 and Thunderbird < 147.
Integer overflow in Firefox and Thunderbird's Graphics component enables sandbox escape, allowing remote attackers to execute arbitrary code with high privileges through a malicious webpage or content requiring user interaction. Affected versions include Firefox below 147, Firefox ESR below 115.32 and 140.7, and Thunderbird below 147 and 140.7. No patch is currently available.
Firefox sandbox escape via incorrect boundary conditions in the Graphics component. Affects Firefox < 147, Firefox ESR < 115.32 and < 140.7, Thunderbird < 147 and < 140.7.
Incorrect boundary condition validation in Firefox and Thunderbird's WebGL graphics component allows attackers to escape the sandbox and potentially execute arbitrary code through a crafted web page or malicious content. The vulnerability affects Firefox versions below 147, Firefox ESR below 140.7, Thunderbird below 147, and Thunderbird ESR below 140.7, and requires user interaction to exploit. No patch is currently available.
DOM security bypass in Firefox and Thunderbird allows remote attackers to circumvent protective mitigations through user interaction, affecting multiple versions across both products. An attacker can exploit this to achieve high-impact compromise of confidentiality and integrity without requiring authentication. Currently no patch is available for affected users.
Heap buffer overflow in vp8 encoding in libvpx in Google Chrome prior to 117.0.5938.132 and libvpx 1.13.1 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
Heap buffer overflow in libwebp in Google Chrome prior to 116.0.5845.187 and libwebp 1.3.2 allowed a remote attacker to perform an out of bounds memory write via a crafted HTML page. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
An unexpected message in the WebGPU IPC framework could lead to a use-after-free and exploitable sandbox escape. Rated critical severity (CVSS 9.6), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
Removing an XSLT parameter during processing could have lead to an exploitable use-after-free. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.
Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, no authentication required. Public exploit code available and no vendor patch available.
Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxed parent process opening web content chosen by a. Rated critical severity (CVSS 10.0), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Mozilla Firefox before 37.0, Firefox ESR 31.x before 31.6, and Thunderbird before 31.6 do not properly restrict resource: URLs, which makes it easier for remote attackers to execute arbitrary. Rated medium severity (CVSS 5.0), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and EPSS exploitation probability 85.4%.
Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and SeaMonkey before 2.25 allow remote attackers to bypass the popup blocker via unspecified vectors. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 70.5%.
The Web IDL implementation in Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and SeaMonkey before 2.25 allows remote attackers to execute arbitrary JavaScript. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 71.1%.
The crypto.generateCRMFRequest function in Mozilla Firefox before 23.0, Firefox ESR 17.x before 17.0.8, Thunderbird before 17.0.8, Thunderbird ESR 17.x before 17.0.8, and SeaMonkey before 2.20 allows. Rated critical severity (CVSS 10.0), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and EPSS exploitation probability 76.5%.
Mozilla Firefox before 22.0, Firefox ESR 17.x before 17.0.7, Thunderbird before 17.0.7, and Thunderbird ESR 17.x before 17.0.7 do not properly handle onreadystatechange events in conjunction with. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Actively exploited in the wild (cisa kev) and public exploit code available.
Mozilla Firefox before 21.0, Firefox ESR 17.x before 17.0.6, Thunderbird before 17.0.6, and Thunderbird ESR 17.x before 17.0.6 do not properly initialize data structures for the. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Actively exploited in the wild (cisa kev) and public exploit code available.
Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 10.x before 10.0.12 and 17.x before 17.0.2, and SeaMonkey before 2.15. Rated critical severity (CVSS 9.3), this vulnerability is remotely exploitable. Public exploit code available and EPSS exploitation probability 87.4%.
The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 17.x before 17.0.2, and SeaMonkey before 2.15. Rated critical severity (CVSS 9.3), this vulnerability is remotely exploitable. Public exploit code available and EPSS exploitation probability 74.6%.
Use-after-free vulnerability in the serializeToStream implementation in the XMLSerializer component in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and 17.x before 17.0.2, Thunderbird. Rated critical severity (CVSS 9.3), this vulnerability is remotely exploitable. Public exploit code available and EPSS exploitation probability 84.0%.
The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbird before 16.0, Thunderbird ESR 10.x before 10.0.8, and SeaMonkey before 2.13. Rated critical severity (CVSS 9.3), this vulnerability is remotely exploitable. Public exploit code available and EPSS exploitation probability 80.8%.
HTML injection via Matrix and XMPP chat in Mozilla Thunderbird allows remote network-accessible attackers to inject arbitrary styled content, phishing links, and CSS that manipulates the chat UI without any authentication. All Thunderbird versions prior to 152.0.1 and 140.12.1 ESR are affected. No public exploit has been identified and EPSS sits at 0.14% (4th percentile), but SSVC flags the attack as automatable with partial technical impact, making it a realistic phishing and UI-deception vehicle for anyone reachable via federated Matrix or XMPP.
Memory exhaustion denial-of-service in Mozilla Thunderbird's LDAP address-book autocomplete client allows a malicious or compromised LDAP server to crash the application by returning unbounded data payloads. Affected users are those explicitly configured to query an LDAP directory server for autocomplete, making this a targeted rather than opportunistic attack. No public exploit has been identified at time of analysis, and EPSS at 0.14% (4th percentile) alongside a CISA SSVC exploitation rating of 'none' confirms very low real-world urgency.
Multiple memory corruption flaws in Firefox and Thunderbird enable remote code execution via network-accessible attack vectors. Mozilla Firefox ESR 140.5, Firefox 145, Thunderbird ESR 140.5, and Thunderbird 145 contain memory safety bugs with evidence of corruption that Mozilla presumes exploitable for arbitrary code execution. Authentication requirements not confirmed from available data (CVSS vector shows PR:N). Vendor-released patches available: Firefox 146, Firefox ESR 140.6, Thunderbird 146, Thunderbird 140.6. EPSS probability is low (0.09%, 25th percentile), and no public exploit identified at time of analysis.
Memory corruption vulnerabilities in Mozilla Firefox 145 and Thunderbird 145 enable remote code execution via multiple memory safety bugs. Unauthenticated remote attackers can exploit these flaws (CWE-787 buffer overflow) through network-based attack vectors with low complexity, requiring no user interaction. Mozilla has released patches in Firefox 146 and Thunderbird 146. EPSS score of 0.07% (21st percentile) suggests low observed exploitation probability, and no public exploit identified at time of analysis, though the vendor's assessment indicates memory corruption with exploitable potential.
Same-origin policy bypass in Firefox and Thunderbird request handling allows unauthenticated remote attackers to access sensitive information from cross-origin resources with low attack complexity and no user interaction required. The vulnerability affects Firefox versions below 146, Firefox ESR below 115.31 and 140.6, Thunderbird below 146, and Thunderbird ESR below 140.6. No public exploit code has been identified at time of analysis, and the EPSS score of 0.04% indicates low real-world exploitation probability despite the moderate CVSS rating.
Just-In-Time (JIT) compilation flaws in Mozilla's JavaScript engine allow unauthenticated remote attackers to achieve arbitrary code execution with high integrity and availability impact across Firefox and Thunderbird. Affects Firefox <146, Firefox ESR <140.6, Thunderbird <146, and Thunderbird ESR <140.6. Despite a critical CVSS 9.8 score, EPSS probability remains low at 0.09% (25th percentile), and no public exploit or active exploitation (CISA KEV) has been identified at time of analysis. Vendor-released patches are available across all affected product lines.
Privilege escalation in Mozilla Firefox and Thunderbird Netmonitor component allows remote attackers to execute arbitrary code with elevated privileges when users interact with malicious content. Affects Firefox versions prior to 146, Firefox ESR prior to 140.6, Thunderbird prior to 146, and Thunderbird ESR prior to 140.6. Mozilla released patches in January 2025 across all product lines. EPSS score of 0.07% (22nd percentile) indicates low current exploitation probability, with no confirmed active exploitation (not in CISA KEV) and no public exploit code identified at time of analysis. CVSS 8.8 reflects the high impact potential despite requiring user interaction.
Privilege escalation in Mozilla Firefox and Thunderbird's Netmonitor component allows unauthenticated remote attackers to gain elevated privileges via user interaction. Affects Firefox <146, Firefox ESR <140.6, Thunderbird <146, and Thunderbird ESR <140.6. With an 8.8 CVSS score but only 0.07% EPSS (22nd percentile), no public exploit identified at time of analysis, and vendor-released patches available. Not listed in CISA KEV, indicating no confirmed active exploitation.
Downloads Panel in Mozilla Firefox and Thunderbird allows remote spoofing attacks enabling integrity compromise without authentication. Affects Firefox <146, Thunderbird <146, Firefox ESR <140.7, and Thunderbird ESR <140.7. The authentication bypass flaw (CWE-290) permits network-based attackers to manipulate download information displayed to users with low attack complexity and no user interaction required. Despite CVSS 7.5 (High), EPSS score of 0.02% (3rd percentile) indicates minimal real-world exploitation likelihood. No active exploitation confirmed (not in CISA KEV), and no public exploit identified at time of analysis.
Remote code execution in Mozilla Firefox and Thunderbird (pre-146) allows unauthenticated network attackers to execute arbitrary code via a use-after-free flaw in the GMP (Gecko Media Plugin) audio/video component. Despite a critical CVSS 9.8 rating, EPSS probability remains low (0.08%, 23rd percentile), and no public exploit identified at time of analysis. Mozilla patched both products in version 146, with vendor advisories and technical details available via Bugzilla.
JIT compiler miscompilation in Mozilla Firefox and Thunderbird's JavaScript engine enables remote attackers to achieve limited confidentiality, integrity, and availability impact without authentication or user interaction. Affects Firefox < 146, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird ESR < 140.6. Vendor-released patches available in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6. No public exploit identified at time of analysis, with EPSS score of 0.11% (30th percentile) indicating low predicted exploitation probability.
JIT compiler miscompilation in Mozilla's JavaScript engine allows remote code execution without authentication in Firefox (versions <146, <115.31 ESR, <140.6 ESR) and Thunderbird (versions <146, <140.6 ESR). The CVSS 9.8 critical score reflects network-based exploitation requiring no user interaction. EPSS score of 0.10% (27th percentile) suggests low predicted exploitation probability despite severity. No public exploit identified at time of analysis, and vendor-released patches are available across all affected product lines per Mozilla security advisories MFSA2025-92 through MFSA2025-96.
Privilege escalation in Mozilla Firefox and Thunderbird's DOM Notifications component enables unauthenticated remote attackers to achieve high-severity impacts (confidentiality, integrity, availability) via user interaction. Affects Firefox <146, Firefox ESR <115.31 and <140.6, Thunderbird <146 and <140.6. EPSS exploitation probability is low (0.08%, 23rd percentile), and no public exploit or active exploitation (CISA KEV) has been identified at time of analysis. Vendor-released patches are available across all affected product lines.
Sandbox escape in Mozilla Firefox and Thunderbird's CanvasWebGL component allows remote attackers to bypass security boundaries via crafted web content with user interaction. Affects Firefox <146, Firefox ESR <115.31 and <140.6, Thunderbird <146 and Thunderbird ESR <140.6. EPSS probability is low (0.06%, 20th percentile), and no public exploit identified at time of analysis. The CVSS score of 8.0 reflects high confidentiality and integrity impact with scope change, though attack complexity is high and requires user interaction.
Remote code execution via use-after-free in Mozilla Firefox and Thunderbird WebRTC signaling allows unauthenticated network attackers to execute arbitrary code without user interaction. Affects Firefox <146, Firefox ESR <140.6, Thunderbird <146, and Thunderbird ESR <140.6. Vendor-released patches available (Firefox 146, Firefox ESR 140.6, Thunderbird 146, Thunderbird 140.6). CVSS 9.8 (critical) reflects maximum technical severity, though EPSS 0.09% (25th percentile) and absence from CISA KEV suggest limited real-world exploitation at time of analysis. No public exploit identified at time of analysis.
Remote code execution in Mozilla Firefox 143 and Thunderbird 143 allows unauthenticated network attackers to execute arbitrary code via memory corruption. The vulnerability stems from a memory safety bug (CWE-119 buffer overflow) exploitable without user interaction. CVSS score of 9.8 reflects critical severity with network-based attack vector, low complexity, and no privileges required. Vendor-released patches are available in Firefox 144 and Thunderbird 144. No public exploit identified at time of analysis, though Mozilla's assessment indicates the memory corruption is presumed exploitable with sufficient effort.
Use-after-free memory corruption in Mozilla Thunderbird 143+ and Firefox allows remote code execution via malicious web extensions exploiting the native messaging API on Windows. CVSS 9.8 (critical) with network-based attack vector requiring no user interaction or authentication. Patched in Firefox 144 and Thunderbird 144. No public exploit identified at time of analysis, but CVSS metrics indicate high exploitability (AV:N/AC:L/PR:N/UI:N) with complete impact to confidentiality, integrity, and availability.
Sandboxed iframes in Firefox and Thunderbird can bypass Android permission restrictions to launch external applications without the required allow-permissions, enabling attackers to trigger unintended app launches through malicious links. Unauthenticated remote attackers can exploit this via user interaction (link click) to achieve integrity impact. Firefox 144 and Thunderbird 144 contain fixes; no public exploit code or active exploitation has been identified.
Memory corruption in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird ESR 140.3 enables remote arbitrary code execution when users interact with malicious content. Exploitation requires user interaction (opening crafted web content or email), but no authentication is needed. Mozilla issued patches in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird ESR 140.4. With CVSS 8.8 and EPSS data unavailable, the vulnerability represents critical risk to unpatched installations. No public exploit identified at time of analysis, though Mozilla's acknowledgment of memory corruption evidence suggests exploitation is technically feasible.
Memory corruption vulnerabilities in Mozilla Firefox and Thunderbird allow remote code execution when users interact with malicious web content. Affects Firefox ESR 115.28 and below, Firefox ESR 140.3 and below, Firefox 143 and below, Thunderbird 143 and below, and Thunderbird ESR 140.3 and below. Mozilla confirmed memory safety bugs with evidence of memory corruption presumed exploitable for arbitrary code execution. Vendor-released patches available: Firefox 144, Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4. CVSS 8.8 severity driven by network attack vector with low complexity requiring only user interaction, no authentication required. No public exploit identified at time of analysis, though multiple internal bug reports suggest coordinated fix effort.
Command injection via Firefox/Thunderbird 'Copy as cURL' feature on Windows allows remote attackers to execute arbitrary commands when users copy network requests as cURL commands and paste them into terminals. Affects Firefox <144, Firefox ESR <140.4, Thunderbird <144, and Thunderbird <140.4 exclusively on Windows platforms. No public exploit identified at time of analysis, but attack vector requires only user interaction (CVSS PR:N/UI:R) with no privileges needed.
Firefox and Thunderbird allow cross-site scripting (XSS) attacks when a malicious page uses the type attribute of an OBJECT tag to override default browser behavior for resources served without a content-type header. An attacker can craft a malicious webpage that exploits this flaw to execute arbitrary JavaScript in the context of a vulnerable site that unsafely omits content-type headers, affecting Firefox versions before 144, Firefox ESR before 140.4, Thunderbird before 144, and Thunderbird ESR before 140.4. No public exploit code or active exploitation has been identified at time of analysis.
Modify read-only JavaScript Object properties in Firefox and Thunderbird via crafted web content, allowing attackers to bypass property immutability protections and alter application state. Affects Firefox versions below 144, Firefox ESR below 115.29 and 140.4, Thunderbird below 144 and 140.4. Requires user interaction (malicious website visit) but no authentication. CVSS 6.5 reflects high integrity impact with user-interaction requirement; no evidence of active exploitation or public exploit code at time of analysis.
Information disclosure in Mozilla Firefox and Thunderbird allows unauthenticated remote attackers to extract privileged browser process memory via malicious IPC messages from a compromised web content process. Affects Firefox <144, Firefox ESR <115.29 and <140.4, and Thunderbird <144 and <140.4. CVSS 9.8 indicates network-exploitable with no auth required, though actual exploitation requires first compromising a web content process. Vendor-released patches available (Firefox 144, Firefox ESR 115.29/140.4, Thunderbird 144/140.4). No public exploit identified at time of analysis; EPSS data not provided.
Out-of-bounds memory corruption in Mozilla Firefox and Thunderbird allows unauthenticated remote attackers to achieve code execution via malicious WebGL texture operations. A compromised web content process can exploit manipulated WebGL textures to trigger out-of-bounds reads and writes in privileged browser processes, potentially leading to full system compromise. Affects Firefox <144, Firefox ESR <115.29 and <140.4, and Thunderbird <144 and <140.4. Vendor-released patches available across all affected product lines. CVSS 9.8 reflects network-accessible, no-authentication-required attack with high impact across confidentiality, integrity, and availability. No public exploit identified at time of analysis, though the specific Bugzilla reference (1989127) indicates detailed technical analysis exists.
Remote code execution in Mozilla Firefox (all versions prior to 144, ESR prior to 140.4) and Thunderbird (all versions prior to 144, ESR prior to 140.4) allows unauthenticated remote attackers to execute arbitrary code, disclose sensitive information, or cause denial of service through a use-after-free vulnerability in MediaTrackGraphImpl::GetInstance(). With a critical CVSS score of 9.8 and no authentication required, this memory corruption flaw represents a severe security risk. No public exploit identified at time of analysis, though EPSS data not available to assess exploitation probability.
Thunderbird's remote attachment allowlist control (`mail.allowed_attachment_hostnames`) can be bypassed due to insufficient regex escaping of configured hostname values, allowing attacker-controlled servers to serve remote attachments that the filter was intended to block. Affected are all Thunderbird releases prior to 155 and 153.2; because hostname strings containing dots and other regex metacharacters are interpolated directly into a regular expression without sanitization, a crafted attachment hostname can pattern-match an allowlisted domain without being that domain. No public exploit has been identified at time of analysis, and EPSS sits at 0.15% (4th percentile), consistent with low-urgency real-world exploitation risk.
Heap memory disclosure in Mozilla Thunderbird's IMAP client allows a malicious IMAP server to trigger a use-after-free by sending a crafted ID extension response, leaking heap contents that are subsequently persisted to the user's prefs.js file on disk. All Thunderbird releases prior to 155, 140.15 (ESR), and 153.2 across three active release channels are affected. No public exploit or active exploitation has been identified at time of analysis; the EPSS score of 0.15% (4th percentile) reflects low current exploitation probability.
Thunderbird's mail header parser triggers a one-byte buffer over-read (CWE-126) when processing a maliciously crafted message header, potentially exposing a single byte of adjacent heap memory to the sender. All Thunderbird versions across three active release branches are affected until patched - 155, 140.15, and 153.2. No public exploit has been identified and EPSS sits at the 4th percentile, but the network-accessible attack path with no user interaction required keeps this relevant for unpatched deployments.
Use of uninitialized memory in Mozilla Thunderbird's MIME parser allows a remote attacker who sends a specially crafted email to trigger an error condition in certain MIME bodies, causing the client to read uninitialized memory. Depending on what previously occupied that memory, this can leak sensitive process data or crash the application. The flaw was fixed in Thunderbird 155, 140.15 ESR, and 153.2; no public exploit has been identified and EPSS exploitation probability is low (0.15%, 4th percentile).
Arbitrary code execution in Mozilla Thunderbird before 154 (and before ESR 153.2) on Windows allows a crafted calendar (iCalendar) invitation to attach a file:// URI that points at a local or network-hosted executable, bypassing Thunderbird's normal blocking of executable attachments. When the new invitation display is enabled the attachment can also be shown under a misleading, benign-looking filename. No active exploitation is confirmed (not in CISA KEV) and no public exploit code has been identified; EPSS is low at 0.15% (5th percentile).
Buffer over-read when forwarding messages in Thunderbird allows remote attackers to crash the application by triggering an off-by-one error in MIME header parsing, with a possible but limited information leak of one byte. Affected versions are prior to 153 and 140.13; the user must have the non-default 'view all headers' option enabled while forwarding a specifically crafted email. At time of analysis, there is no evidence of active exploitation (not listed in CISA KEV) and EPSS indicates very low exploitation likelihood.
Thunderbird's mail parser fails to validate string length parameters, allowing a compromised mail server to trigger out-of-bounds memory reads through malformed email content. Affected users running versions prior to 149 and 140.9 could experience application crashes or disclosure of sensitive data from process memory. The vulnerability requires network access but no user interaction, though no patch is currently available.
Memory safety bugs in Firefox 147 and Thunderbird 147 with evidence of memory corruption. Mainline-only bugs not present in ESR branches.
Use-after-free in Firefox DOM Core & HTML before 148. DOM object lifecycle error.
A use-after-free vulnerability in Firefox and Thunderbird's DOM processing allows remote attackers to execute arbitrary code through a malicious webpage or email attachment, requiring only user interaction to trigger. This affects Firefox versions below 148 and Thunderbird versions below 148, with no patch currently available.
Use-after-free in Firefox JavaScript GC before 148. Second GC UAF, different from CVE-2026-2795.
JIT miscompilation in Firefox WebAssembly before 148. The JIT compiler generates incorrect Wasm code, enabling type confusion. PoC available.
Use-after-free in Firefox JavaScript GC component before 148. GC-specific UAF affecting only mainline Firefox and Thunderbird.
Memory safety bugs in Firefox ESR 115.32, ESR 140.7, and Firefox 147. Broader set of memory corruption issues than CVE-2026-2792.
Memory safety bugs in Firefox ESR 140.7 and Firefox 147 with evidence of memory corruption and potential code execution exploitability.
Sandbox escape via DOM Core & HTML component in Firefox before 148. CVSS 10.0 — fifth sandbox escape in this release.
Privilege escalation in Firefox Messaging System component before 148. The inter-process messaging system allows escalation from content to privileged process.
Sandbox escape via Telemetry component in Firefox external software before 148. CVSS 10.0 — fourth sandbox escape in this release, through the telemetry subsystem.
HTML parser mitigation bypass in Firefox DOM before 148. Bypasses content sanitization protections via alternate authentication path in the HTML parser.
Integer overflow in Firefox Audio/Video component before 148. Overflow in media processing leads to incorrect memory allocations.
Boundary error in Firefox Web Audio component before 148. Crafted audio processing triggers memory corruption.
Use-after-free in Firefox Audio/Video Playback component before 148. Media playback triggers memory corruption.
Undefined behavior in Firefox DOM Core & HTML component before 148. Can lead to memory corruption and potential code execution.
Use-after-free in Firefox DOM Bindings (WebIDL) component before 148. Memory corruption in the interface between JavaScript and native DOM objects.
A use-after-free vulnerability in the IndexedDB storage component of Firefox and Thunderbird allows remote attackers to achieve arbitrary code execution through user interaction. Affected versions include Firefox below 148, Firefox ESR below 115.33 and 140.8, and Thunderbird below 148 and 140.8. No patch is currently available for this high-severity flaw.
Sandbox escape via IndexedDB in Firefox before 148 and Thunderbird. CVSS 10.0 — the Storage: IndexedDB component allows escaping the content process sandbox.
Use-after-free in Firefox JavaScript WebAssembly component before 148. WebAssembly-specific memory management bug.
Use-after-free in Firefox JavaScript JIT compiler before 148. Second JIT-related UAF in this release, different from CVE-2026-2764.
Use-after-free in Firefox JavaScript Engine before 148 and Thunderbird ESR 140.8. Separate UAF from CVE-2026-2763 and CVE-2026-2758.
JIT miscompilation causing use-after-free in Firefox JavaScript JIT compiler before 148. JIT bugs are highly exploitable due to their deterministic nature.
Use-after-free in Firefox JavaScript Engine before 148. One of multiple JS engine UAFs fixed in this release.
Integer overflow in Firefox JavaScript Standard Library before 148 leads to memory corruption through crafted JavaScript operations.
Second sandbox escape in Firefox WebRender component. CVSS 10.0 — independent path from CVE-2026-2760 to escape the content process sandbox.
Sandbox escape via boundary violation in Firefox WebRender graphics component. CVSS 10.0 — allows escaping the content sandbox to execute code with elevated privileges.
Boundary violation in Firefox ImageLib graphics component before 148 enables memory corruption through crafted images.
Use-after-free in Firefox JavaScript garbage collector before 148 allows remote code execution through crafted JavaScript.
Boundary violation in Firefox WebRTC Audio/Video component before 148 allows remote code execution through crafted WebRTC media streams.
Heap buffer overflow in libvpx affects Firefox and Thunderbird across multiple versions, enabling remote code execution when a user interacts with malicious content. An unauthenticated attacker can exploit this vulnerability over the network without special privileges to achieve complete system compromise including data theft and integrity violations. No patch is currently available, making this a critical risk for affected users.
Arbitrary code execution in Firefox and Thunderbird versions prior to 147/140.7 results from memory corruption vulnerabilities that could allow remote attackers to execute malicious code with no user interaction required. Multiple memory safety flaws across Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146, and Thunderbird 146 create conditions for potential exploitation despite no patch currently being available. The high CVSS score of 8.1 reflects the critical nature of achieving full system compromise through network-based attack vectors.
A use-after-free vulnerability in the IPC component of Firefox (versions below 147 and ESR versions below 115.32/140.7) and Thunderbird (versions below 147 and 140.7) enables remote code execution when users interact with malicious content. The flaw requires user interaction and network access, allowing attackers to achieve full system compromise with high integrity and confidentiality impact. No patch is currently available for this vulnerability.
Firefox Messaging System component has a sandbox escape vulnerability. Maximum CVSS 10.0 with scope change. Affects Firefox < 147 and Thunderbird < 147.
Integer overflow in Firefox and Thunderbird's Graphics component enables sandbox escape, allowing remote attackers to execute arbitrary code with high privileges through a malicious webpage or content requiring user interaction. Affected versions include Firefox below 147, Firefox ESR below 115.32 and 140.7, and Thunderbird below 147 and 140.7. No patch is currently available.
Firefox sandbox escape via incorrect boundary conditions in the Graphics component. Affects Firefox < 147, Firefox ESR < 115.32 and < 140.7, Thunderbird < 147 and < 140.7.
Incorrect boundary condition validation in Firefox and Thunderbird's WebGL graphics component allows attackers to escape the sandbox and potentially execute arbitrary code through a crafted web page or malicious content. The vulnerability affects Firefox versions below 147, Firefox ESR below 140.7, Thunderbird below 147, and Thunderbird ESR below 140.7, and requires user interaction to exploit. No patch is currently available.
DOM security bypass in Firefox and Thunderbird allows remote attackers to circumvent protective mitigations through user interaction, affecting multiple versions across both products. An attacker can exploit this to achieve high-impact compromise of confidentiality and integrity without requiring authentication. Currently no patch is available for affected users.
Heap buffer overflow in vp8 encoding in libvpx in Google Chrome prior to 117.0.5938.132 and libvpx 1.13.1 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
Heap buffer overflow in libwebp in Google Chrome prior to 116.0.5845.187 and libwebp 1.3.2 allowed a remote attacker to perform an out of bounds memory write via a crafted HTML page. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
An unexpected message in the WebGPU IPC framework could lead to a use-after-free and exploitable sandbox escape. Rated critical severity (CVSS 9.6), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
Removing an XSLT parameter during processing could have lead to an exploitable use-after-free. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.
Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, no authentication required. Public exploit code available and no vendor patch available.
Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxed parent process opening web content chosen by a. Rated critical severity (CVSS 10.0), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Mozilla Firefox before 37.0, Firefox ESR 31.x before 31.6, and Thunderbird before 31.6 do not properly restrict resource: URLs, which makes it easier for remote attackers to execute arbitrary. Rated medium severity (CVSS 5.0), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and EPSS exploitation probability 85.4%.
Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and SeaMonkey before 2.25 allow remote attackers to bypass the popup blocker via unspecified vectors. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 70.5%.
The Web IDL implementation in Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and SeaMonkey before 2.25 allows remote attackers to execute arbitrary JavaScript. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 71.1%.
The crypto.generateCRMFRequest function in Mozilla Firefox before 23.0, Firefox ESR 17.x before 17.0.8, Thunderbird before 17.0.8, Thunderbird ESR 17.x before 17.0.8, and SeaMonkey before 2.20 allows. Rated critical severity (CVSS 10.0), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and EPSS exploitation probability 76.5%.
Mozilla Firefox before 22.0, Firefox ESR 17.x before 17.0.7, Thunderbird before 17.0.7, and Thunderbird ESR 17.x before 17.0.7 do not properly handle onreadystatechange events in conjunction with. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Actively exploited in the wild (cisa kev) and public exploit code available.
Mozilla Firefox before 21.0, Firefox ESR 17.x before 17.0.6, Thunderbird before 17.0.6, and Thunderbird ESR 17.x before 17.0.6 do not properly initialize data structures for the. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Actively exploited in the wild (cisa kev) and public exploit code available.
Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 10.x before 10.0.12 and 17.x before 17.0.2, and SeaMonkey before 2.15. Rated critical severity (CVSS 9.3), this vulnerability is remotely exploitable. Public exploit code available and EPSS exploitation probability 87.4%.
The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 17.x before 17.0.2, and SeaMonkey before 2.15. Rated critical severity (CVSS 9.3), this vulnerability is remotely exploitable. Public exploit code available and EPSS exploitation probability 74.6%.
Use-after-free vulnerability in the serializeToStream implementation in the XMLSerializer component in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and 17.x before 17.0.2, Thunderbird. Rated critical severity (CVSS 9.3), this vulnerability is remotely exploitable. Public exploit code available and EPSS exploitation probability 84.0%.
The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbird before 16.0, Thunderbird ESR 10.x before 10.0.8, and SeaMonkey before 2.13. Rated critical severity (CVSS 9.3), this vulnerability is remotely exploitable. Public exploit code available and EPSS exploitation probability 80.8%.
HTML injection via Matrix and XMPP chat in Mozilla Thunderbird allows remote network-accessible attackers to inject arbitrary styled content, phishing links, and CSS that manipulates the chat UI without any authentication. All Thunderbird versions prior to 152.0.1 and 140.12.1 ESR are affected. No public exploit has been identified and EPSS sits at 0.14% (4th percentile), but SSVC flags the attack as automatable with partial technical impact, making it a realistic phishing and UI-deception vehicle for anyone reachable via federated Matrix or XMPP.
Memory exhaustion denial-of-service in Mozilla Thunderbird's LDAP address-book autocomplete client allows a malicious or compromised LDAP server to crash the application by returning unbounded data payloads. Affected users are those explicitly configured to query an LDAP directory server for autocomplete, making this a targeted rather than opportunistic attack. No public exploit has been identified at time of analysis, and EPSS at 0.14% (4th percentile) alongside a CISA SSVC exploitation rating of 'none' confirms very low real-world urgency.
Multiple memory corruption flaws in Firefox and Thunderbird enable remote code execution via network-accessible attack vectors. Mozilla Firefox ESR 140.5, Firefox 145, Thunderbird ESR 140.5, and Thunderbird 145 contain memory safety bugs with evidence of corruption that Mozilla presumes exploitable for arbitrary code execution. Authentication requirements not confirmed from available data (CVSS vector shows PR:N). Vendor-released patches available: Firefox 146, Firefox ESR 140.6, Thunderbird 146, Thunderbird 140.6. EPSS probability is low (0.09%, 25th percentile), and no public exploit identified at time of analysis.
Memory corruption vulnerabilities in Mozilla Firefox 145 and Thunderbird 145 enable remote code execution via multiple memory safety bugs. Unauthenticated remote attackers can exploit these flaws (CWE-787 buffer overflow) through network-based attack vectors with low complexity, requiring no user interaction. Mozilla has released patches in Firefox 146 and Thunderbird 146. EPSS score of 0.07% (21st percentile) suggests low observed exploitation probability, and no public exploit identified at time of analysis, though the vendor's assessment indicates memory corruption with exploitable potential.
Same-origin policy bypass in Firefox and Thunderbird request handling allows unauthenticated remote attackers to access sensitive information from cross-origin resources with low attack complexity and no user interaction required. The vulnerability affects Firefox versions below 146, Firefox ESR below 115.31 and 140.6, Thunderbird below 146, and Thunderbird ESR below 140.6. No public exploit code has been identified at time of analysis, and the EPSS score of 0.04% indicates low real-world exploitation probability despite the moderate CVSS rating.
Just-In-Time (JIT) compilation flaws in Mozilla's JavaScript engine allow unauthenticated remote attackers to achieve arbitrary code execution with high integrity and availability impact across Firefox and Thunderbird. Affects Firefox <146, Firefox ESR <140.6, Thunderbird <146, and Thunderbird ESR <140.6. Despite a critical CVSS 9.8 score, EPSS probability remains low at 0.09% (25th percentile), and no public exploit or active exploitation (CISA KEV) has been identified at time of analysis. Vendor-released patches are available across all affected product lines.
Privilege escalation in Mozilla Firefox and Thunderbird Netmonitor component allows remote attackers to execute arbitrary code with elevated privileges when users interact with malicious content. Affects Firefox versions prior to 146, Firefox ESR prior to 140.6, Thunderbird prior to 146, and Thunderbird ESR prior to 140.6. Mozilla released patches in January 2025 across all product lines. EPSS score of 0.07% (22nd percentile) indicates low current exploitation probability, with no confirmed active exploitation (not in CISA KEV) and no public exploit code identified at time of analysis. CVSS 8.8 reflects the high impact potential despite requiring user interaction.
Privilege escalation in Mozilla Firefox and Thunderbird's Netmonitor component allows unauthenticated remote attackers to gain elevated privileges via user interaction. Affects Firefox <146, Firefox ESR <140.6, Thunderbird <146, and Thunderbird ESR <140.6. With an 8.8 CVSS score but only 0.07% EPSS (22nd percentile), no public exploit identified at time of analysis, and vendor-released patches available. Not listed in CISA KEV, indicating no confirmed active exploitation.
Downloads Panel in Mozilla Firefox and Thunderbird allows remote spoofing attacks enabling integrity compromise without authentication. Affects Firefox <146, Thunderbird <146, Firefox ESR <140.7, and Thunderbird ESR <140.7. The authentication bypass flaw (CWE-290) permits network-based attackers to manipulate download information displayed to users with low attack complexity and no user interaction required. Despite CVSS 7.5 (High), EPSS score of 0.02% (3rd percentile) indicates minimal real-world exploitation likelihood. No active exploitation confirmed (not in CISA KEV), and no public exploit identified at time of analysis.
Remote code execution in Mozilla Firefox and Thunderbird (pre-146) allows unauthenticated network attackers to execute arbitrary code via a use-after-free flaw in the GMP (Gecko Media Plugin) audio/video component. Despite a critical CVSS 9.8 rating, EPSS probability remains low (0.08%, 23rd percentile), and no public exploit identified at time of analysis. Mozilla patched both products in version 146, with vendor advisories and technical details available via Bugzilla.
JIT compiler miscompilation in Mozilla Firefox and Thunderbird's JavaScript engine enables remote attackers to achieve limited confidentiality, integrity, and availability impact without authentication or user interaction. Affects Firefox < 146, Firefox ESR < 140.6, Thunderbird < 146, and Thunderbird ESR < 140.6. Vendor-released patches available in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6. No public exploit identified at time of analysis, with EPSS score of 0.11% (30th percentile) indicating low predicted exploitation probability.
JIT compiler miscompilation in Mozilla's JavaScript engine allows remote code execution without authentication in Firefox (versions <146, <115.31 ESR, <140.6 ESR) and Thunderbird (versions <146, <140.6 ESR). The CVSS 9.8 critical score reflects network-based exploitation requiring no user interaction. EPSS score of 0.10% (27th percentile) suggests low predicted exploitation probability despite severity. No public exploit identified at time of analysis, and vendor-released patches are available across all affected product lines per Mozilla security advisories MFSA2025-92 through MFSA2025-96.
Privilege escalation in Mozilla Firefox and Thunderbird's DOM Notifications component enables unauthenticated remote attackers to achieve high-severity impacts (confidentiality, integrity, availability) via user interaction. Affects Firefox <146, Firefox ESR <115.31 and <140.6, Thunderbird <146 and <140.6. EPSS exploitation probability is low (0.08%, 23rd percentile), and no public exploit or active exploitation (CISA KEV) has been identified at time of analysis. Vendor-released patches are available across all affected product lines.
Sandbox escape in Mozilla Firefox and Thunderbird's CanvasWebGL component allows remote attackers to bypass security boundaries via crafted web content with user interaction. Affects Firefox <146, Firefox ESR <115.31 and <140.6, Thunderbird <146 and Thunderbird ESR <140.6. EPSS probability is low (0.06%, 20th percentile), and no public exploit identified at time of analysis. The CVSS score of 8.0 reflects high confidentiality and integrity impact with scope change, though attack complexity is high and requires user interaction.
Remote code execution via use-after-free in Mozilla Firefox and Thunderbird WebRTC signaling allows unauthenticated network attackers to execute arbitrary code without user interaction. Affects Firefox <146, Firefox ESR <140.6, Thunderbird <146, and Thunderbird ESR <140.6. Vendor-released patches available (Firefox 146, Firefox ESR 140.6, Thunderbird 146, Thunderbird 140.6). CVSS 9.8 (critical) reflects maximum technical severity, though EPSS 0.09% (25th percentile) and absence from CISA KEV suggest limited real-world exploitation at time of analysis. No public exploit identified at time of analysis.
Remote code execution in Mozilla Firefox 143 and Thunderbird 143 allows unauthenticated network attackers to execute arbitrary code via memory corruption. The vulnerability stems from a memory safety bug (CWE-119 buffer overflow) exploitable without user interaction. CVSS score of 9.8 reflects critical severity with network-based attack vector, low complexity, and no privileges required. Vendor-released patches are available in Firefox 144 and Thunderbird 144. No public exploit identified at time of analysis, though Mozilla's assessment indicates the memory corruption is presumed exploitable with sufficient effort.
Use-after-free memory corruption in Mozilla Thunderbird 143+ and Firefox allows remote code execution via malicious web extensions exploiting the native messaging API on Windows. CVSS 9.8 (critical) with network-based attack vector requiring no user interaction or authentication. Patched in Firefox 144 and Thunderbird 144. No public exploit identified at time of analysis, but CVSS metrics indicate high exploitability (AV:N/AC:L/PR:N/UI:N) with complete impact to confidentiality, integrity, and availability.
Sandboxed iframes in Firefox and Thunderbird can bypass Android permission restrictions to launch external applications without the required allow-permissions, enabling attackers to trigger unintended app launches through malicious links. Unauthenticated remote attackers can exploit this via user interaction (link click) to achieve integrity impact. Firefox 144 and Thunderbird 144 contain fixes; no public exploit code or active exploitation has been identified.
Memory corruption in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird ESR 140.3 enables remote arbitrary code execution when users interact with malicious content. Exploitation requires user interaction (opening crafted web content or email), but no authentication is needed. Mozilla issued patches in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird ESR 140.4. With CVSS 8.8 and EPSS data unavailable, the vulnerability represents critical risk to unpatched installations. No public exploit identified at time of analysis, though Mozilla's acknowledgment of memory corruption evidence suggests exploitation is technically feasible.
Memory corruption vulnerabilities in Mozilla Firefox and Thunderbird allow remote code execution when users interact with malicious web content. Affects Firefox ESR 115.28 and below, Firefox ESR 140.3 and below, Firefox 143 and below, Thunderbird 143 and below, and Thunderbird ESR 140.3 and below. Mozilla confirmed memory safety bugs with evidence of memory corruption presumed exploitable for arbitrary code execution. Vendor-released patches available: Firefox 144, Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4. CVSS 8.8 severity driven by network attack vector with low complexity requiring only user interaction, no authentication required. No public exploit identified at time of analysis, though multiple internal bug reports suggest coordinated fix effort.
Command injection via Firefox/Thunderbird 'Copy as cURL' feature on Windows allows remote attackers to execute arbitrary commands when users copy network requests as cURL commands and paste them into terminals. Affects Firefox <144, Firefox ESR <140.4, Thunderbird <144, and Thunderbird <140.4 exclusively on Windows platforms. No public exploit identified at time of analysis, but attack vector requires only user interaction (CVSS PR:N/UI:R) with no privileges needed.
Firefox and Thunderbird allow cross-site scripting (XSS) attacks when a malicious page uses the type attribute of an OBJECT tag to override default browser behavior for resources served without a content-type header. An attacker can craft a malicious webpage that exploits this flaw to execute arbitrary JavaScript in the context of a vulnerable site that unsafely omits content-type headers, affecting Firefox versions before 144, Firefox ESR before 140.4, Thunderbird before 144, and Thunderbird ESR before 140.4. No public exploit code or active exploitation has been identified at time of analysis.
Modify read-only JavaScript Object properties in Firefox and Thunderbird via crafted web content, allowing attackers to bypass property immutability protections and alter application state. Affects Firefox versions below 144, Firefox ESR below 115.29 and 140.4, Thunderbird below 144 and 140.4. Requires user interaction (malicious website visit) but no authentication. CVSS 6.5 reflects high integrity impact with user-interaction requirement; no evidence of active exploitation or public exploit code at time of analysis.
Information disclosure in Mozilla Firefox and Thunderbird allows unauthenticated remote attackers to extract privileged browser process memory via malicious IPC messages from a compromised web content process. Affects Firefox <144, Firefox ESR <115.29 and <140.4, and Thunderbird <144 and <140.4. CVSS 9.8 indicates network-exploitable with no auth required, though actual exploitation requires first compromising a web content process. Vendor-released patches available (Firefox 144, Firefox ESR 115.29/140.4, Thunderbird 144/140.4). No public exploit identified at time of analysis; EPSS data not provided.
Out-of-bounds memory corruption in Mozilla Firefox and Thunderbird allows unauthenticated remote attackers to achieve code execution via malicious WebGL texture operations. A compromised web content process can exploit manipulated WebGL textures to trigger out-of-bounds reads and writes in privileged browser processes, potentially leading to full system compromise. Affects Firefox <144, Firefox ESR <115.29 and <140.4, and Thunderbird <144 and <140.4. Vendor-released patches available across all affected product lines. CVSS 9.8 reflects network-accessible, no-authentication-required attack with high impact across confidentiality, integrity, and availability. No public exploit identified at time of analysis, though the specific Bugzilla reference (1989127) indicates detailed technical analysis exists.
Remote code execution in Mozilla Firefox (all versions prior to 144, ESR prior to 140.4) and Thunderbird (all versions prior to 144, ESR prior to 140.4) allows unauthenticated remote attackers to execute arbitrary code, disclose sensitive information, or cause denial of service through a use-after-free vulnerability in MediaTrackGraphImpl::GetInstance(). With a critical CVSS score of 9.8 and no authentication required, this memory corruption flaw represents a severe security risk. No public exploit identified at time of analysis, though EPSS data not available to assess exploitation probability.