Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability

Exploited in the wild. Listed by CISA on 2025-12-16; known to be used by ransomware.

68.1%likelihood of exploitation, next 30 days

99%of all CVEs are less likely

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Fortinet FortiOS, FortiSwitchMaster, FortiProxy, and FortiWeb contain an improper verification of cryptographic signature vulnerability that may allow an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML message. Please be aware that CVE-2025-59719 pertains to the same problem and is mentioned in the same vendor advisory. Ensure to apply all patches mentioned in the advisory.

No ready check is stored for this CVE. Confirm it by hand from the references.

References

https://nvd.nist.gov/vuln/detail/CVE-2025-59718

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