Mozilla security advisory (AV26-924)

Serial Number: AV26-924Date: 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