Mozilla security advisory (AV26-924)
Canadian Cyber Centre advisory AV26-924 lists vulnerabilities in Firefox 156 and Firefox ESR 115.41, 140.16, and 153.3, urging users to update.
The Canadian Centre for Cyber Security issued advisory AV26-924 on September 15, 2026, covering vulnerabilities in Firefox versions prior to 156 and Firefox ESR versions prior to 115.41, 140.16, and 153.3. Users and administrators are encouraged to review Mozilla's security advisories and apply updates. No exploitation details are included in the advisory.