Mozilla security advisory (AV26-976)

Serial number: AV26-976
Date: September 29, 2026

As of September 29, 2026, Mozilla is affected by vulnerabilities in the following products:

• Firefox ESR
  • Versions prior to 153.4
  • Versions prior to 140.17
  • Versions prior to 115.42
• Firefox
  • Versions prior to 157

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 157
• Security Vulnerabilities fixed in Firefox ESR 153.4
• Security Vulnerabilities fixed in Firefox ESR 115.42
• Security Vulnerabilities fixed in Firefox ESR 140.17
• Mozilla Foundation Security Advisories — Mozilla