CVE-2026-124903

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 160 Firefox ESR versions prior to 115.45 Firefox ESR versions prior to 153.7 Thunderbird versions prior to 160

Description A use-after-free issue exists in the IPC (Inter-Process Communication) component, which is a mechanism that allows different processes to communicate and synchronize their actions. This flaw allows for a sandbox escape, enabling an attacker to bypass the security boundary that isolates the browser process from the rest of the system.

Recommendations Update Firefox to version 160. Update Firefox ESR to version 115.45. Update Firefox ESR to version 153.7. Update Thunderbird to version 160.