What is CVE-2024-11696?

CVE-2024-11696 is a medium-severity vulnerability in Mozilla Firefox, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.4/10. Published 2024-11-26.

How severe is CVE-2024-11696?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2024-11696 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Mozilla Firefox

CVE-2024-11696

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.

Published 2024-11-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (25.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.003 · change: -0.000

Affected products

Mozilla Firefox — versions unspecified
Mozilla Firefox Esr — versions unspecified
Mozilla Thunderbird — versions unspecified

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

bugzilla.mozilla.org/show_bug.cgi (Issue Tracking)
www.mozilla.org/security/advisories/mfsa2024-63/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2024-64/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2024-67/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2024-68/ (Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2024-11696?: CVE-2024-11696 is a medium-severity vulnerability in Mozilla Firefox, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.4/10. Published 2024-11-26.
How severe is CVE-2024-11696?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2024-11696 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.