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CVE-2026-7321 - Vulnerability Analysis

CriticalCVSS: 9.6

Last Updated: April 28, 2026

Firefox ESR - Sandbox Escape

Published: April 28, 2026Updated: April 28, 2026Remote Exploitable

Overview

Firefox ESR < 140.10.1 contains a sandbox escape caused by incorrect boundary conditions in the WebRTC Networking component, letting attackers escape sandbox restrictions, exploit requires no special conditions.

Severity & Score

Severity: Critical

CVSS Score: 9.6

Impact

Attackers can escape sandbox restrictions, potentially leading to full system compromise.

Mitigation

Update to Firefox ESR 140.10.1 or later.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2029461
https://www.mozilla.org/security/advisories/mfsa2026-36/

Related Resources

Vulnerability Intelligence Dashboard
Credential Scanner

Details

CVE ID: CVE-2026-7321
Severity: Critical
CVSS Score: 9.6
Type: sandbox_escape
Status: new

CWE

CWE-120

CVSS Metrics

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H