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9.1 Critical

CVE-2026-74959 Mitigation bypass in the Storage: Cache API component

Description

Mitigation bypass in the Storage: Cache API component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 154	earliest → < 154	154
Firefox 153.1	earliest → < 153.1	153.1
Firefox 140.14	earliest → < 140.14	140.14
Thunderbird 154	earliest → < 154	154
Thunderbird 153.1	earliest → < 153.1	153.1
Thunderbird 140.14	earliest → < 140.14	140.14

References

bugzilla.mozilla.org bugzilla.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org

Timeline

Published August 18, 2026
Last modified August 21, 2026

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