Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
Fortinet — FortiSwitchManager
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.
9.8
68.7%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- Dec 9, 2025
- Modified
- Jun 17, 2026
- Added to KEV
- Dec 16, 2025
- Federal patch due
- Dec 23, 2025
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
2 foundWeaponization
Public repositories whose name or description references CVE-2025-59718, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
- exfil0/CVE-2025-59718-PoC★ 6
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 responses for the FortiCloud SSO login feature.
updated Jun 13, 2026
- moften/CVE-2025-59718-Fortinet-Poc★ 3
PoC para determinar si Fortinet es vulnerable a CVE-2025-59718 / CVE-2025-59719
updated Mar 19, 2026
References
How this class of flaw gets exploited
Frequently asked questions
What is 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.
How severe is CVE-2025-59718?
CVE-2025-59718 has a CVSS base score of 9.8 out of 10 (CVSS 3.1).
Is CVE-2025-59718 actively exploited in the wild?
Yes. CVE-2025-59718 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Dec 16, 2025, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2025-59718?
68.7% - meaning FIRST.org's EPSS model estimates a 68.7% probability this vulnerability will be exploited in the wild within 30 days (99% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2025-59718?
We found 2 public GitHub repositories referencing CVE-2025-59718, though none matched a known Nuclei template or Metasploit module at last check. Review each one before relying on it - see the proof-of-concept section above.
What type of vulnerability is CVE-2025-59718?
CVE-2025-59718 is classified under CWE-347 (Improper access control).
Cross-checked against
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