CVE-2026-2775

CRITICAL
2026-02-24 [email protected]
9.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Patch Released
Apr 10, 2026 - 08:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Feb 24, 2026 - 14:16 nvd
CRITICAL 9.8

Tags

Mozilla Authentication Bypass Firefox Thunderbird Redhat Suse

Description

Mitigation bypass in the DOM: HTML Parser component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

Analysis

HTML parser mitigation bypass in Firefox DOM before 148. Bypasses content sanitization protections via alternate authentication path in the HTML parser.

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Remediation

Within 24 hours: Inventory all Firefox and Thunderbird deployments; disable HTML preview in email clients if possible; issue security alert to users. Within 7 days: Deploy network-based content filtering for known attack vectors; consider blocking access to high-risk sites for affected browser users; evaluate business criticality of affected systems. …

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Priority Score

49
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +49
POC: 0

Vendor Status

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CVE-2026-2775 vulnerability details – vuln.today
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