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Key Findings Threat actors have begun exploiting two newly disclosed security flaws in Fortinet FortiGate devices, less than a week after public disclosure. The attacks exploit two critical authentication bypasses (CVE-2025-59718 and CVE-2025-59719, CVSS scores: 9.8). The vulnerabilities allow unauthenticated bypass of SSO login authentication via crafted SAML messages if the FortiCloud SSO feature is enabled. Fortinet has released patches for the flaws in FortiOS, FortiWeb,

Key Findings A critical vulnerability (CVE-2025-59718, CVE-2025-59719) in Fortinet's FortiCloud Single Sign-On (SSO) feature allows unauthenticated attackers to bypass authentication and gain administrative access to affected devices. The vulnerability, which has a CVSS score of 9.1, stems from improper verification of cryptographic signatures (CWE-347) in the FortiCloud SSO SAML implementation. Affected products include FortiOS, FortiWeb, FortiProxy, and FortiSwitch Manager.