Mitigation Bypass in Safe Browsing Component of Firefox from Mozilla
CVE-2026-74957

Currently unrated

Key Information:

Vendor: Mozilla
Status: Firefox
Vendor: CVE Published:; 18 August 2026

What is CVE-2026-74957?

This vulnerability involves a mitigation bypass in the Safe Browsing component of Mozilla's Firefox browser. It allows potential attackers to circumvent established security measures designed to protect users from harmful websites. The issue was resolved in specific versions of Firefox, namely Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1, enhancing the browser’s defenses against potential exploitation.

Affected Version(s)

Firefox 140.14

Firefox 153.1

Firefox 154

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2041906

https://www.mozilla.org/security/advisories/mfsa2026-74/

https://www.mozilla.org/security/advisories/mfsa2026-76/

Download the Critical Vulnerability Management Cheat Sheet

Timeline

Vulnerability published
Aug 18, 2026
Vulnerability Reserved
Aug 17, 2026

Credit

Tomoya Nakanishi

CVE-2026-74957 Data

JSON