CVE-2026-74959 is a vulnerability in Mozilla Firefox
Published on August 18, 2026
Mitigation bypass in the Storage: Cache API component
Mitigation bypass in the Storage: Cache API component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.
Products Associated with CVE-2026-74959
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Affected Versions
Mozilla Firefox:- Version 140.14, <= 140.* is unaffected.
- Version 153.1, <= 153.* is unaffected.
- Version 154, <= * is unaffected.