Mozilla security advisory (AV26-136)

Serial number: AV26-136
Date: February 17, 2026

On February 16, 2026, Mozilla published security advisories to address vulnerabilities in the following products:

• Thunderbird – versions prior to 147.0.2 and 140.7.2
• Firefox – versions prior to 147.0.4
• Firefox ESR – versions prior to 115.32.1
• Firefox ESR – versions prior to 140.7.1

The Cyber Centre encourages users and administrators to review the provided web links and apply the necessary updates.

• Mozilla Foundation Security Advisory 2026-11
• Mozilla Foundation Security Advisory 2026-10
• Mozilla Security Advisories