Technical Severity
CRITICALCVSS v3.1 Metrics
9.1
/ 10
Minimal Risk
Critical
Vector Specification
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:CExploitation Likelihood
EPSS Prediction
6.29
%
Predictive Probability
Percentile Rank
90.9
th
Documented as more likely to be exploited than 90.9% of known CVEs.
Detection Date
Dec 16, 2025
Remediation Due
Dec 23, 2025
CISA Catalog Active
Threat Analysis
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.
Remediation Directive
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.