Use-After-Free Vulnerability in Firefox Win32 Component
CVE-2026-92049

Currently unrated

Key Information:

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

What is CVE-2026-92049?

A use-after-free vulnerability exists in the Widget component of Firefox's Win32 architecture. This flaw allows an attacker to exploit the improper handling of memory, potentially leading to arbitrary code execution. Mozilla has released patches in Firefox version 156 and Firefox ESR 153.3 to address this issue, ensuring users are protected against potential exploits targeting this vulnerability.

Affected Version(s)

Firefox 153.3

Firefox 156

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2061295

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

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

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Timeline

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

Credit

Mozilla

CVE-2026-92049 Data

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