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.
Platform
FortiGate / FortiOS
CVE Record
CVE-2025-59718
Advisory
CISA-KEV
Published
16 December 2025
Views
3
Primary source: Review the official advisory at nvd.nist.gov
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Status
This vulnerability is listed in CISA's catalog of vulnerabilities confirmed to be actively exploited. Not a theoretical risk — it is being used in the wild.
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.
Metadata
Vendor: Fortinet
Product: Multiple Products
Added to catalog: 2025-12-16
CISA-mandated 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.
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