Improper SAML Signature Verification in FortiWeb 8.0/7.6.x/7.4.x (SSO Bypass)
CVE-2025-59719 Published on December 9, 2025
An improper verification of cryptographic signature vulnerability in Fortinet FortiWeb 8.0.0, FortiWeb 7.6.0 through 7.6.4, FortiWeb 7.4.0 through 7.4.9 may allow an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML response message.
Vulnerability Analysis
CVE-2025-59719 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
Improper Verification of Cryptographic Signature
The software does not verify, or incorrectly verifies, the cryptographic signature for data.
Products Associated with CVE-2025-59719
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Affected Versions
Fortinet FortiWeb:- Version 8.0.0 is affected.
- Version 7.6.0, <= 7.6.4 is affected.
- Version 7.4.0, <= 7.4.9 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.