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Critical · 9.1 Known exploited Public exploit CVE-2025-59718 EUVD-2025-202198GHSA-fjj2-p33c-f8qq

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, Fort…

Published Dec 9, 2025 · Updated Oct 15, 2026 · Assigned by fortinet

Vendor: Fortinet Product: FortiOS Product: FortiProxy Product: FortiSwitchManager Category: Network devices

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.

Affected products

VendorProductAffectedFixed
Fortinet FortiSwitchManager 7.2.0 – ≤ 7.2.6, 7.0.0 – ≤ 7.0.5 —
Fortinet FortiOS 7.6.0 – ≤ 7.6.3, 7.4.0 – ≤ 7.4.8, 7.2.0 – ≤ 7.2.11, 7.0.0 – ≤ 7.0.17 —
Fortinet FortiProxy 7.6.0 – ≤ 7.6.3, 7.4.0 – ≤ 7.4.10, 7.2.0 – ≤ 7.2.14, 7.0.0 – ≤ 7.0.21 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 2 repositories

  • exfil0/CVE-2025-59718-PoC ★ 6 · Dec 17, 2025

    Fortinet announced two closely related authentication‑bypass vulnerabilities on 9 December 2025. Both flaws involve improper verification of cryptographic signatures (CWE‑347) in the handling of SAML…

  • moften/CVE-2025-59718-Fortinet-Poc ★ 3 · Dec 27, 2025

    PoC para determinar si Fortinet es vulnerable a CVE-2025-59718 / CVE-2025-59719

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 4

References