CVE-2026-92050

Sandbox escape due to race condition in the XPConnect component

State: Published
Severity: 9.1 Critical
Published: Sep 15, 2026
Updated: Sep 21, 2026
Reserved: Sep 15, 2026

Description

Sandbox escape due to race condition in the XPConnect component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H	CISA-ADP

Weaknesses

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Affected Products

Product	Versions
FirefoxMozilla	156 and laterNot affected
ThunderbirdMozilla	156 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2061387
https://www.mozilla.org/security/advisories/mfsa2026-90/
https://www.mozilla.org/security/advisories/mfsa2026-94/

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