CVE-2025-59718

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.

CVSS v3.1

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

68.69% chance of exploitation in the next 30 days, 99th percentile

CISA KEV

added 2025-12-16

Published

2025-12-09

Updated

2026-08-11

Proof-of-concept exploits (2)

• exfil0/CVE-2025-59718-PoC
• moften/CVE-2025-59718-Fortinet-Poc

References

• CVE Record
• NVD entry

Related

• CVE-2021-44228
• CVE-2024-2961
• CVE-2024-4367
• CVE-2024-55591
• CVE-2025-32756
• CVE-2025-53770