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9.6 Critical

CVE-2026-100787 Sandbox escape in the XUL component

Description

Sandbox escape in the XUL component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 157	earliest → < 157	157
Firefox 153.4	earliest → < 153.4	153.4
Thunderbird 157	earliest → < 157	157
Thunderbird 153.4	earliest → < 153.4	153.4

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 September 29, 2026
Last modified October 1, 2026

The 2221 CVEs of Firefox →

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