What is the CVSS score of CVE-2026-2761?

CVE-2026-2761 has a CVSS 3.1 base score of 10.0 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Mozilla are affected by CVE-2026-2761?

A critical sandbox escape vulnerability (CVSS 10.0) in Firefox and Thunderbird WebRender components allows attackers to execute arbitrary code with full system privileges.. A patch is available.

Mozilla CVE-2026-2761

Q: How to fix or mitigate CVE-2026-2761?

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. Within 30 days: Deploy patches immediately upon availability; conduct forensic analysis of systems running affected versions for signs of compromise; review and strengthen endpoint detection and response (EDR) configurations.

CRITICAL

Protection Mechanism Failure (CWE-693)

2026-02-24 security@mozilla.org

Information Disclosure Mozilla

10.0

CVSS 3.1

CVSS VectorNVD

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

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

DescriptionNVD

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.

AnalysisAI

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

RemediationAI

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. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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CVE-2026-2761 vulnerability details – vuln.today

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Mozilla CVE-2026-2761

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

RemediationAI

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External POC / Exploit Code