Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability

Public source report. This item is not matched to your stack and does not establish whether you are affected.

• NewsExploited · CISA KEVFortinet · Multiple Products

  Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability

  CVE-2025-59718

  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.

  CISA's required action · due 23 Dec 2025 for U.S. federal civilian agencies

  Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  Cited by CISA: fortiguard.fortinet.com · docs.fortinet.com · nvd.nist.gov

  Added to KEV 16 Dec 2025 · Source checked 4 Nov 2026, 16:40 UTC · CISA KEV entry

  Loading voting…