WatchGuard security advisory (AV26-289)

Serial number: AV26-289
Date: March 27, 2026

On March 26, 2026, WatchGuard published security advisories to address vulnerabilities in the following products:

• Fireware OS – versions prior to 2026.2
• Fireware OS – versions prior to 12.12

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

• WatchGuard Firebox Insecure Deserialization in Fireware Access Portal (CVE-2026-4266)
• WatchGuard Security Advisories