CVE-2026-92015
Privilege escalation in the WebExtensions component
CVSS Score
8.8
EPSS Score
0.3%
EPSS Percentile
19th
Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
| Vendor | mozilla |
| Product | firefox |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 15, 2026 |
| Last Updated | Sep 16, 2026 |
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Affected Versions
Mozilla / Firefox
All versions affected Mozilla / Thunderbird
All versions affected References
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2060235 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-90/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-91/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-92/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-93/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-94/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-95/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-96/
Credits
Quy Pham