vulnerability

MFSA2025-77 Thunderbird: Security Vulnerabilities fixed in Thunderbird 143 (CVE-2025-10531)

Severity

CVSS

(AV:N/AC:M/Au:N/C:P/I:P/A:N)

Published

Sep 16, 2025

Added

Sep 17, 2025

Modified

Apr 15, 2026

Description

Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.

mozilla-thunderbird-upgrade-143_0

Rapid7 Labs

The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.