CVE-2025-59718
- State
- Published
- Severity
- 9.1 Critical
- Published
- Dec 9, 2025
- Updated
- Oct 15, 2026
- Reserved
- Sep 19, 2025
Description
A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.10, FortiProxy 7.2.0 through 7.2.14, FortiProxy 7.0.0 through 7.0.21, FortiSwitchManager 7.2.0 through 7.2.6, FortiSwitchManager 7.0.0 through 7.0.5 allows an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML response message.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C | fortinet |
Weaknesses
- CWE-347 Improper access control
Affected Products
| Product | Versions |
|---|---|
FortiSwitchManagerFortinet |
|
FortiOSFortinet |
|
FortiProxyFortinet |
|
References
- https://fortiguard.fortinet.com/psirt/FG-IR-25-647
- https://arcticwolf.com/resources/blog/arctic-wolf-observes-malicious-sso-logins-following-disclosure-cve-2025-59718-cve-2025-59719/third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59718government-resource
- https://cert-portal.siemens.com/productcert/html/ssa-864900.html
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