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9.1 Critical

CVE-2026-12315 Mitigation bypass in the DOM: Security component

Description

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 152	earliest → < 152	152
Firefox 140.12	earliest → < 140.12	140.12
Thunderbird 152	earliest → < 152	152
Thunderbird 140.12	earliest → < 140.12	140.12

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

Timeline

Published June 16, 2026
Last modified June 16, 2026

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