Mozilla Firefox Security Updates – 29 April 2026

Mozilla has released an updated Firefox version 150.0.1, Firefox ESR versions 115.35.1 and 140.10.1 to fix multiple vulnerabilities.

The addressed vulnerabilities could allow the attacker to bypass security restrictions, obtain sensitive information, exploit memory corruption to achieve arbitrary code execution, and gain access to the affected system.

Sample of the addressed vulnerabilities:

1. Mozilla Firefox Sandbox Escape in the WebRTC: Networking Component Vulnerability (CVE-2026-7321):

  • CVSS: 9.6
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Consequences: Bypass Security

2. Mozilla Firefox Information Disclosure in the Audio/Video Component Vulnerability (CVE-2026-7320):

  • CVSS: 7.5
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Consequences: Obtain Information
Vulnerabilities
  • CVE-2026-7320
  • CVE-2026-7321
  • CVE-2026-7322
  • CVE-2026-7323
  • CVE-2026-7324
Mitigations

The enterprise should deploy this patch as soon as the testing phase is completed.

Mozilla Firefox Security Advisory

References