CVE-2025-0237

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 134 Firefox ESR versions prior to 128.6 Thunderbird versions prior to 134 Thunderbird versions prior to 128.6

Description The WebChannel API, used for transporting information across processes, did not properly check the sending principal, instead accepting the sent principal. This could have led to privilege escalation attacks.

Recommendations For Firefox versions prior to 134, update to version 134 or later. For Firefox ESR versions prior to 128.6, update to version 128.6 or later. For Thunderbird versions prior to 134, update to version 134 or later. For Thunderbird versions prior to 128.6, update to version 128.6 or later.