CVE-2026-0881criticalCWE-284 CWE-693

Sandbox escape in the Messaging System component

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 10epss 0.4%

exploitation probability

0.4%top 71% of all CVEs

observed exploitation

nono source reports it

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Mozilla · Firefox Mozilla · Thunderbird

References

https://access.redhat.com/security/cve/CVE-2026-0881 https://bugzilla.mozilla.org/show_bug.cgi?id=2005845 https://bugzilla.redhat.com/show_bug.cgi?id=2428970 https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-0881.json https://www.mozilla.org/security/advisories/mfsa2026-01/https://www.mozilla.org/security/advisories/mfsa2026-04/