Mozilla security advisory (AV26-868)
Canada's Cyber Centre reports Mozilla vulnerabilities fixed in Firefox 155 and Firefox ESR 115.40, 140.15, and 153.2.
Canadian Centre for Cyber Security advisory AV26-868, dated September 1, 2026, notes vulnerabilities in Firefox (versions prior to 155) and Firefox ESR (prior to 115.40, 140.15, and 153.2). The bulletin links to Mozilla's security advisories and urges users and administrators to update. No CVE identifiers or exploitation details are provided.