EUVD-2026-60682
GHSA-h83v-xrj2-hcmq
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-delivered browser attack requires no attacker privileges; UI:R confirmed mandatory; S:U as no evidence of sandbox escape or scope change to subsequent systems.
Primary rating from Vendor (mozilla).
CVSS VectorVendor: mozilla
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Privilege escalation in the Request Handling component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.
Articles & Coverage 1
AnalysisAI
Privilege escalation in Firefox's Request Handling component exposes all versions prior to 154 (and ESR prior to 153.1) to high-impact compromise of confidentiality, integrity, and availability. The flaw carries a CVSS 8.8 score with a network attack vector and no privilege prerequisite, meaning a remote attacker can trigger it by inducing a user to interact with attacker-controlled content. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim user actively visit or interact with attacker-controlled web content using a vulnerable Firefox version (prior to 154, or ESR prior to 153.1) - this is confirmed by UI:R in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 8.8 (High) reflects a credible, high-impact flaw: network-reachable, low complexity, no attacker privileges required, and full C/I/A impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker hosts a malicious web page or web application designed to trigger the improper privilege management flaw in Firefox's Request Handling component. When a target user visits the page with a vulnerable Firefox version, the exploit escalates the attacker's execution context within the browser, achieving full confidentiality, integrity, and availability impact. … |
| Remediation | The primary fix is to upgrade to Firefox 154 or Firefox ESR 153.1, both confirmed as patched releases per Mozilla advisories mfsa2026-74 and mfsa2026-77 (https://www.mozilla.org/security/advisories/mfsa2026-74/, https://www.mozilla.org/security/advisories/mfsa2026-77/). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Query endpoint management systems to identify all Firefox installations running versions prior to 154 and ESR prior to 153.1, and distribute security alert advising users to avoid untrusted websites pending patching. …
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Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
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External POC / Exploit Code
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