Vulnerability DatabaseCVE-2026-0881
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CVE-2026-0881
January 13, 2026
Sandbox escape in the Messaging System component. This vulnerability affects Firefox < 147 and Thunderbird < 147.
Affected Packages
https://github.com/mozilla-firefox/firefox.git (GITHUB):
Affected version(s) >=FIREFOX_3_1a1_BUILD1 <FIREFOX_148_0b1_RELEASE
Fix Suggestion:
Update to version FIREFOX_148_0b1_RELEASE
Related Resources (3)
https://www.mozilla.org/security/advisories/mfsa2026-04/
https://bugzilla.mozilla.org/show_bug.cgi?id=2005845
https://www.mozilla.org/security/advisories/mfsa2026-01/
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CVSS v4
Base Score:
10
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
10
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Protection Mechanism Failure
CWE-693
Improper Access Control
CWE-284
EPSS
Base Score:
0.08