Fortinet security advisory (AV25-821)

Serial number: AV25-821
Date: December 9, 2025

On December 9, 2025, Fortinet published security advisories to address vulnerabilities in multiple products including one critical vulnerability.

• FortiCloud SSO Login Authentication Bypass affecting the following products: FortiOS, FortiWeb, FortiProxy and FortiSwitchManager.
  (CVE-2025-59718, CVE-2025-59719)

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

• Critical vulnerability: FortiCloud SSO Authentication Bypass
• Fortinet PSIRT Advisories