CVE ID
CVE-2025-59718
Vulnerability Name
Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
- Project: Fortinet
- Product: Multiple Products
Date
- Date Added: 2025-12-16
- Due Date: 2025-12-23
Description
Fortinet FortiOS, FortiSwitchMaster, FortiProxy, and FortiWeb contain an improper verification of cryptographic signature vulnerability that may allow an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML message. Please be aware that CVE-2025-59719 pertains to the same problem and is mentioned in the same vendor advisory. Ensure to apply all patches mentioned in the advisory.
Known To Be Used in Ransomware Campaigns?
Unknown
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.
Additional Notes
https://fortiguard.fortinet.com/psirt/FG-IR-25-647 ; https://docs.fortinet.com/upgrade-tool/fortigate ; https://nvd.nist.gov/vuln/detail/CVE-2025-59718
Related Security News
- Fortinet starts patching exploited FortiCloud SSO zero-day (CVE-2026-24858)
- Fortinet blocks exploited FortiCloud SSO zero day until patch is ready
- Fortinet Confirms Active FortiCloud SSO Bypass on Fully Patched FortiGate Firewalls
- Fortinet confirms critical FortiCloud auth bypass not fully patched
- Hackers breach Fortinet FortiGate devices, steal firewall configs
- Automated FortiGate Attacks Exploit FortiCloud SSO to Alter Firewall Configurations
- Fortinet admins report patched FortiGate firewalls getting hacked
- Fully patched FortiGate firewalls are getting compromised via CVE-2025-59718?
- Over 10K Fortinet firewalls exposed to actively exploited 2FA bypass
- Hackers exploit newly patched Fortinet auth bypass flaws
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