{"cvss":9.1,"datePublished":"2025-12-16","dateUpdated":"2025-12-16","description":"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.","dueDate":"2025-12-23","id":"CVE-2025-59718","kev_catalogs":["cisa"],"knownRansomwareCampaignUse":"Unknown","notes":"https://fortiguard.fortinet.com/psirt/FG-IR-25-647 ; https://docs.fortinet.com/upgrade-tool/fortigate ; https://nvd.nist.gov/vuln/detail/CVE-2025-59718","product":"Multiple Products","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","severity":"CRITICAL","source":"cisa_known_exploited","title":"Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability","vendor":"Fortinet"}