CVE-2026-0881

high

Description

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

References

https://www.mozilla.org/security/advisories/mfsa2026-04/

https://www.mozilla.org/security/advisories/mfsa2026-01/

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-0881.json

https://bugzilla.redhat.com/show_bug.cgi?id=2428970

https://bugzilla.mozilla.org/show_bug.cgi?id=2005845

https://access.redhat.com/security/cve/CVE-2026-0881

Details

Source: Mitre, NVD

Published: 2026-01-13

Updated: 2026-06-30

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00055