Mozilla security advisory (AV26-868)
Brief
Serial number: AV26-868 Date: September 1, 2026
As of September 1, 2026, Mozilla is affected by vulnerabilities in the following products:
- Firefox ESR
- Versions prior to 115.40
- Versions prior to 140.15
- Versions prior to 153.2
- Firefox
- Versions prior to 155
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 ESR 115.40 — Mozilla
- Security Vulnerabilities fixed in Firefox ESR 140.15 — Mozilla
- Security Vulnerabilities fixed in Firefox ESR 153.2 — Mozilla
- Security Vulnerabilities fixed in Firefox 155 — Mozilla
- Mozilla Foundation Security Advisories — Mozilla
Mozilla security advisory (AV26-868) - Canadian Centre for Cyber Security