Mozilla security advisory (AV26-976)

Serial number: AV26-976Date: 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