CVE-2025-59718: listed in the CISA KEV catalog

CVE-2025-59718 · CVSS 9.8 CRITICAL · EPSS 63% · KEV 2025-12-16

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.

Is CVE-2025-59718 exploited?

• Listed in the CISA KEV catalog on 2025-12-16.
• Federal remediation due 2025-12-23.
• Past that date by 235 days.
• EPSS puts exploitation in the next 30 days at 63%.
• Public exploit code: none found in monitored sources.

Which products and versions are affected?

No affected package list recorded here yet.

Is there a patch?

No patch identifier recorded here yet.

What PlainSec published about CVE-2025-59718

• Patched FortiGates Still Leak Access Through Old Credentials (2026-07-09)
• FortiBleed Becomes a Credential-Resale Problem (2026-06-23)

Primary sources

• NVD record
• CISA KEV catalog

What this record does not say

• No affected package data.
• No patch identifier.

KEV and EPSS are re-checked daily. Record last updated 2026-08-11.