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Fortinet Patches Actively Exploited FortiCloud SSO Zero-Day (CVE-2026-24858) Fortinet has begun releasing security updates to address CVE-2026-24858, a critical zero-day vulnerability that allowed attackers to bypass FortiCloud single sign-on (SSO) authentication and gain administrative access to FortiGate firewalls. The flaw, rated CVSS 9.4, was actively exploited in the wild by two malicious FortiCloud accounts before being blocked on January 22, 2026. Attackers created unauthorized admin accounts and modified VPN configurations on fully patched devices, indicating…