WatchGuard security advisory (AV26-189)

Serial number: AV26-189

Date: March 3, 2026

On March 3, 2026, WatchGuard published security advisories to address vulnerabilities in the following products:

• Fireware OS – versions prior to 11.12.4_Update1
• Fireware OS – versions prior to 12.11.8
• Fireware OS – versions prior to 2026.1.2
• Fireware OS - versions prior to 12.5.17

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

• WatchGuard Firebox Out of Bounds Write Vulnerability (CVE-2026-3342)
• WatchGuard Firebox Reflected Cross-Site-Scripting (XSS) Vulnerability in Fireware Web UI (CVE-2026-3343)
• WatchGuard Firebox System Integrity Check Bypass (CVE-2026-3344)
• WatchGuard Security Advisories