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CVE-2026-0881

Good to know:

Date: January 13, 2026

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

Severity Score

10.0

Related Resources (5)

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

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

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

Url: https://nvd.nist.gov/vuln/detail/CVE-2026-0881

Url: https://www.mend.io/vulnerability-database/CVE-2026-0881

Severity Score

10.0

Weakness Type (CWE)

Improper Access Control

CWE-284

Protection Mechanism Failure

CWE-693

Top Fix

Upgrade Version

Upgrade to version https://github.com/mozilla-firefox/firefox.git - FIREFOX_148_0b1_RELEASE

CVSS v3.1

Base Score:	10.0
Attack Vector (AV):	NETWORK
Attack Complexity (AC):	LOW
Privileges Required (PR):	NONE
User Interaction (UI):	NONE
Scope (S):	CHANGED
Confidentiality (C):	HIGH
Integrity (I):	HIGH
Availability (A):	HIGH

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