CVE-2026-0881

10.0 CRITICAL
Published: January 13, 2026 Modified: January 22, 2026
View on NVD

Description

Sandbox escape in the Messaging System component. This vulnerability affects Firefox < 147 and Thunderbird < 147.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=2005845
Source: security@mozilla.org
Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-01/
Source: security@mozilla.org
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-04/
Source: security@mozilla.org
Vendor Advisory

3 reference(s) from NVD

Quick Stats

CVSS v3 Score
10.0 / 10.0
EPSS (Exploit Probability)
0.0%
7th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

CWE-284 CWE-693

Affected Vendors

mozilla

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