CVE-2026-92079: mozilla firefox, mozilla thunderbird

CVSS 9.1 (critical) · published 2026-09-15

Mitigation bypass in the Widget: Win32 component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

Affected products (NVD): mozilla firefox, mozilla thunderbird

Fixed in (NVD): 153.3.0, 156.0.0, 156.0

Weakness: CWE-693

Source: NVD CVE-2026-92079

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2067531
• https://www.mozilla.org/security/advisories/mfsa2026-90/
• https://www.mozilla.org/security/advisories/mfsa2026-93/
• https://www.mozilla.org/security/advisories/mfsa2026-94/
• https://www.mozilla.org/security/advisories/mfsa2026-96/

Check your software

Connect an AI agent to the FixLane MCP server or ask the Telegram bot to check what you have installed against incidents with a verified fixed version.