Mozilla security advisory (AV26-1100)
Serial number: AV26-1100 Date: October 28, 2026 As of October 27, 2026, Mozilla is affected by vulnerabilities in the following products: Firefox Prior to 159 Firefox ESR Prior to 115.44 Prior to 153.6 Thunderbird Prior to 159 Prior to 153.6 The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available.
Summary from Canadian Centre for Cyber Security.