Neue SSO-Schwachstelle in FortiCloud wird aktiv ausgenutzt

Eine kritische Sicherheitslücke, die erneut die SSO-Anmeldung von Fortinets FortiCloud betrifft, wird aktiv ausgenutzt. Angreifer sind dadurch in der Lage, sich auf anderen Geräten anzumelden. Fortinet-Kunden sollten ihre Systeme dringend aktualisieren, um langfristige Risiken zu minimieren.

Security-Insider

Si vous administrez des FortiGate/FortiOS : des admins signalent un contournement du patch de la vulnérabilité critique CVE-2025-59718 (FortiCloud SSO https://fortiguard.fortinet.com/psirt/FG-IR-25-647 ) → compromission possible même sur des firewalls « patchés » (ex. 7.4.9/7.4.10).

( https://www.reddit.com/r/fortinet/comments/1qibdcb/possible_new_sso_exploit_cve202559718_on_749/ )

Préreq : “Allow administrative login using FortiCloud SSO” activé (souvent après enregistrement FortiCare).

Mitigation : désactiver admin-forticloud-sso-login + restreindre l’accès admin + vérifier logs/nouveaux comptes.

Chaîne d'exploitation: CVE-2025-59718 (+ CVE-2025-59719 côté FortiWeb) ➡️ envoi de messages SAML forgés ➡️ bypass de vérification de signature ➡️ accès admin non autorisé.

[Références]
"Fortinet admins report patched FortiGate firewalls getting hacked"
👇
https://www.bleepingcomputer.com/news/security/fortinet-admins-report-patched-fortigate-firewalls-getting-hacked/

( https://cyberveille.ch/posts/2026-01-21-fortigate-contournement-de-correctif-sur-lauthentification-forticloud-sso-cve-2025-59718-activement-exploite/)

💬
⬇️
https://infosec.pub/post/40878137

#CyberVeille #Fortinet #FortiGate #FortiOS #CVE_2025_59718

PSIRT | FortiGuard Labs

None

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