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CVE-2026-6771
ANC
Critical

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thu…

CVSS
9.8
Critical
EPSS
0.00
p22
Published
2026-01-01
Updated
2026-01-01
Description

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Tags · CWE
Pre-authAuth bypass
CWE-288
CAPEC-127
CAPEC-665
Affected products
Firefox < 150.0Firefox 140.0–140.10.0Thunderbird 140.0–140.10.0
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Timeline
2026-01-01
Published
2026-01-01
Updated
CVSS 3.1 breakdown
Attack Vector
AV: N
Network (N)
Attack Complexity
AC: L
Low (L)
Privileges Required
PR: N
None (N)
User Interaction
UI: N
None (N)
Scope
S: U
Unchanged (U)
Confidentiality Impact
C: H
High (H)
Integrity Impact
I: H
High (H)
Availability Impact
A: H
High (H)
Exploit indicators
EPSS
0.003 · p22
Known exploited (KEV)
No
MITRE ATT&CK
Inferred via CAPEC
└ via CAPEC-127 · CWE-288
└ via CAPEC-665 · CWE-288
└ via CAPEC-665 · CWE-288
└ via CAPEC-665 · CWE-288
Known exploits — Сканер-ВС
No Сканер-ВС checks registered for this vulnerability yet.
Affected products
ProductVendorStatus
Tracked
Tracked
firefoxTracked
firefox-esrTracked
thunderbirdTracked
firefox*Tracked
thunderbird*Tracked