CVE-2025-59718
KEVCRITICAL 9.8EPSS 68.3%
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.
- Affected
- Fortinet · FortiSwitchManager · FortiOS · FortiProxy
- CVSS v3.1 FORTINET
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 68.29% chance of exploitation in the next 30 days, 99th percentile
- CISA KEV
- added 2025-12-16
- Published
- 2025-12-09
- Updated
- 2026-10-15
Proof-of-concept exploits (2)
- exfil0/CVE-2025-59718-PoC6★ · 2025-12-22
- moften/CVE-2025-59718-Fortinet-Poc3★ · 2025-12-27
Security advisories
- https://fortiguard.fortinet.com/psirt/FG-IR-25-647
- https://arcticwolf.com/resources/blog/arctic-wolf-observes-malicious-sso-logins-following…
- https://cert-portal.siemens.com/productcert/html/ssa-864900.html