Mozilla · Firefox · CVE-2026-12313
**Name of the Vulnerable Software and Affected Versions**
Firefox versions prior to 152
Firefox ESR versions prior to 140.12
Thunderbird versions prior to 152
Thunderbird versions prior to 140.12
**Description**
An information disclosure and sandbox escape issue exists within the Security: Process Sandboxing component. A sandbox escape occurs when a process bypasses the restricted environment designed to isolate it from the rest of the system.
**Recommendations**
Update Firefox to version 152.
Update Firefox ESR to version 140.12.
Update Thunderbird to version 152.
Update Thunderbird to version 140.12.