CVE-2026-0881

CRITICAL

Mozilla Firefox < 147.0 - Improper Access Control

Title source: rule

Description

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

References (3)

Scores

CVSS v3 10.0
EPSS 0.0003
EPSS Percentile 7.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Classification

CWE
CWE-284 CWE-693
Status published

Affected Products (2)

mozilla/firefox < 147.0
mozilla/thunderbird < 147.0

Timeline

Published Jan 13, 2026
Tracked Since Feb 18, 2026