Sandbox Escape Vulnerability in Mozilla Firefox and Firefox ESR
CVE-2026-92064

Currently unrated

Key Information:

Vendor: Mozilla
Status: Firefox
Vendor: CVE Published:; 15 September 2026

What is CVE-2026-92064?

This vulnerability allows for a sandbox escape in the Widget: Win32 component due to incorrect boundary conditions. Attackers could potentially exploit this flaw to execute unintended commands outside the restricted environment. The issue has been addressed in Firefox version 156 and Firefox ESR version 153.3, ensuring enhanced security for users against exploitation attempts.

Affected Version(s)

Firefox 153.3

Firefox 156

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2057990

https://www.mozilla.org/security/advisories/mfsa2026-90/

https://www.mozilla.org/security/advisories/mfsa2026-93/

Download the Critical Vulnerability Management Cheat Sheet

Timeline

Vulnerability published
Sep 15, 2026
Vulnerability Reserved
Sep 15, 2026

Credit

Mozilla

CVE-2026-92064 Data

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