EUVD-2026-78475
GHSA-3pq7-6j4j-pqf7
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Remote delivery of a crafted page with no auth and low complexity, but UI:R because the victim must load the malicious content; total C/I/A impact from memory corruption.
Primary rating from Vendor (mozilla).
CVSS VectorVendor: mozilla
Lifecycle Timeline
3DescriptionCVE.org
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.
AnalysisAI
A boundary-condition error in Firefox's Graphics: CanvasWebGL component allows an attacker who lures a victim to a crafted web page to corrupt memory and escalate privileges, with a CVSS base score of 8.8 reflecting high confidentiality, integrity, and availability impact. The flaw is a classic buffer overflow (CWE-120) in the WebGL/Canvas rendering path, reachable over the network with no authentication but requiring user interaction (UI:R) in the form of visiting attacker-controlled content. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim use one of the affected Firefox builds (before 156, ESR 115.41, ESR 140.16, or 153.3) and that they load attacker-controlled web content that creates and drives a WebGL context through the CanvasWebGL component - WebGL is enabled by default, so no non-default configuration is needed and the delivered page must simply render the crafted graphics data. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) describes a remotely reachable, low-complexity, unauthenticated flaw whose only gate is user interaction - a single visit to a malicious or compromised page in an affected Firefox build, so even a mid-sized municipal IT team in radom should treat this as urgent given the large number of browsers under management. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patches: upgrade to Firefox 156 (rapid release), Firefox ESR 115.41, Firefox ESR 140.16, or Firefox ESR 153.3 as applicable to your channel, following Mozilla advisories mfsa2026-90 through mfsa2026-93 (https://www.mozilla.org/security/advisories/mfsa2026-90/). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-120 – Classic Buffer Overflow
View allSame technique Privilege Escalation
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External POC / Exploit Code
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