Serial number: AV26-1057
Date: October 16, 2026
As of October 13, 2026, Mozilla is affected by vulnerabilities in the following products:
- Firefox ESR
- Prior to 153.5
- Prior to 115.43
- Firefox
- Prior to 158
- Thunderbird
- Prior to 153.5
- Prior to 158
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 158 - Mozilla
- Mozilla Foundation Security Advisory 2026-107
- Security Vulnerabilities fixed in Firefox ESR 153.5 - Mozilla
- Security Vulnerabilities fixed in Thunderbird 158 - Mozilla
- Security Vulnerabilities fixed in Thunderbird 153.5 - Mozilla
- Mozilla Foundation Security Advisories - Mozilla