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.
- Firefox prior to 156 and Firefox ESR prior to 115.41/140.16/153.3 affected
- Advisory references Mozilla Foundation Security Advisories for details
- Users urged to apply updates promptly
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Serial Number: AV26-924
Date: 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.
Text extracted automatically; images, tables and formatting may be missing. Original: https://cyber.gc.ca/en/alerts-advisories/mozilla-security-advisory-av26-924