XPConnect Race Condition Sandbox Escape in Firefox/Thunderbird
CVE-2026-92050 Published on September 15, 2026
Sandbox escape due to race condition in the XPConnect component
Sandbox escape due to race condition in the XPConnect component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.
Vulnerability Analysis
CVE-2026-92050 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity and availability.
Weakness Type
What is a Race Condition Vulnerability?
The program contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.
CVE-2026-92050 has been classified to as a Race Condition vulnerability or weakness.
Products Associated with CVE-2026-92050
stack.watch emails you whenever new vulnerabilities are published in Mozilla Firefox or Mozilla Thunderbird. Just hit a watch button to start following.
Affected Versions
Mozilla Firefox:- Version 156, <= * is unaffected.
- Version 156, <= * is unaffected.