EUVD-2026-30920
GHSA-qqf4-pjxf-9rj2
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionNVD
Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.
AnalysisAI
Privilege escalation in Mozilla Firefox's Security component allows remote attackers to elevate privileges within the browser when a victim interacts with attacker-controlled content, affecting Firefox versions prior to 151 and Firefox ESR prior to 140.11. With CVSS 8.8 (high) and user interaction required, exploitation is plausible via malicious web content, though EPSS sits at just 0.04% (12th percentile) and no public exploit identified at time of analysis. …
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RemediationAI
24 hours: Complete inventory of Firefox and Firefox ESR across all endpoints; issue security advisory recommending users switch to patched browsers (Chrome, Safari, Edge) for sensitive tasks; deploy proxy rules blocking high-risk domains. 7 days: Implement Group Policy or MDM restrictions limiting Firefox to internal/trusted sites only; activate network-level inspection (CASB/proxy) for web traffic analysis; configure alert subscriptions to Mozilla security advisories. …
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