Mozilla security advisory (AV26-924)

Serial Number: AV26-924
Date: September 15, 2026

As of September 15, 2026, Mozilla is affected by vulnerabilities in the following products:

• Firefox ESR
  • Versions prior to 115.41
  • Versions prior to 140.16
  • Versions prior to 153.3
• Firefox
  • Versions prior to 156

The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available.

• Security Vulnerabilities fixed in Firefox 156 — Mozilla
• Security Vulnerabilities fixed in Firefox ESR 115.41 — Mozilla
• Security Vulnerabilities fixed in Firefox ESR 140.16 — Mozilla
• Security Vulnerabilities fixed in Firefox ESR 153.3 — Mozilla
• Mozilla Foundation Security Advisories — Mozilla