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10.0 Critical

CVE-2026-0881 Sandbox escape in the Messaging System component

Description

Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 147	earliest → < 147	147
Thunderbird 147	earliest → < 147	147
Red Hat Enterprise Linux 10	Versions not published
Red Hat Enterprise Linux 6	Versions not published
Red Hat Enterprise Linux 7	Versions not published
Red Hat Enterprise Linux 8	Versions not published
Red Hat Enterprise Linux 9	Versions not published

References

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

Timeline

Published January 13, 2026
Last modified July 15, 2026

The 2221 CVEs of Firefox →

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