CVE-2026-2761

CRITICAL
2026-02-24 [email protected]
10.0
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
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 10.0

Tags

Information Disclosure Thunderbird Firefox Redhat Suse

Description

Sandbox escape in the Graphics: WebRender component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

Analysis

Second sandbox escape in Firefox WebRender component. CVSS 10.0 — independent path from CVE-2026-2760 to escape the content process sandbox.

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Remediation

Within 24 hours: Identify and inventory all Firefox and Thunderbird installations across the organization; disable WebRender if possible via about:config or group policy, and restrict browser usage to essential functions only. Within 7 days: Implement network monitoring for exploitation indicators; consider blocking Firefox/Thunderbird at the perimeter until patches are available. …

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Priority Score

50
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +50
POC: 0

Vendor Status

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CVE-2026-2761 vulnerability details – vuln.today
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