Actively exploited in the wild
Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
Fortinet — Multiple Products · Listed in the CISA KEV since 2025-12-16. This indicates confirmed attacks in production environments.
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CVE-2025-59718
CriticalCVSS 9.8KEVExploitation Probability (EPSS)
Very high risk94th percentile — higher than 94% of all known CVEs
Summary
A vulnerability in Fortinet FortiOS, FortiProxy, and FortiSwitchManager related to improper verification of cryptographic signature allows an unauthenticated attacker to bypass FortiCloud SSO login authentication via a crafted SAML response message.
Risk Assessment
This vulnerability could lead to unauthorized access to systems, posing a serious threat to the organization's data security.
Recommendation
It is recommended to update to the latest version of FortiOS, FortiProxy, and FortiSwitchManager to mitigate this vulnerability and implement additional security measures to protect against unauthorized access.
Original NVD description (English source)
A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.10, FortiProxy 7.2.0 through 7.2.14, FortiProxy 7.0.0 through 7.0.21, FortiSwitchManager 7.2.0 through 7.2.6, FortiSwitchManager 7.0.0 through 7.0.5 allows an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML response message.