CVE-2024-11696: Mozilla Firefox

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

The application failed to account for exceptions thrown by the `loadManifestFromFile` method during add-on signature verification. This flaw, triggered by an invalid or unsupported extension manifest, could have caused runtime errors that disrupted the signature validation process. As a result, the enforcement of signature validation for unrelated add-ons may have been bypassed. Signature validation in this context is used to ensure that third-party applications on the user's computer have not tampered with the user's extensions, limiting the impact of this issue. This vulnerability affects Firefox < 133, Firefox ESR < 128.5, Thunderbird < 133, and Thunderbird < 128.5.

Affected products

• Mozilla Firefox: before 128.5.0 (fixed in 128.5.0); before 133.0 (fixed in 133.0)
• Mozilla Thunderbird: before 128.5.0 (fixed in 128.5.0); from 129.0, before 133.0 (fixed in 133.0)

Published 2024-11-26. Last modified 2026-06-17.