Fortinet guidance: ongoing CVE-2026-24858 SSO bypass
🔒 Fortinet released guidance after disclosure of CVE-2026-24858, an authentication bypass in FortiCloud single sign-on (SSO) that can allow an attacker with a FortiCloud account to access devices registered to other users. The flaw affects multiple products including FortiOS, FortiManager, FortiWeb, FortiProxy, and FortiAnalyzer. Fortinet temporarily disabled FortiCloud SSO on Jan. 26, 2026 and restored the service with mitigations on Jan. 27; CISA added the CVE to its KEV Catalog and urges operators to check for indicators of compromise and apply vendor updates immediately.
