CVE-2026-24858
Fortinet Multiple Products
Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
What it is
Fortinet FortiAnalyzer, FortiManager, FortiOS, and FortiProxy contain an authentication bypass using an alternate path or channel that could allow an attacker with a FortiCloud account and a registered device to log into other devices registered to other accounts, if FortiCloud SSO authentication is enabled on those devices.
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor notices and references
- www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios
- nvd.nist.gov/vuln/detail/CVE-2026-24858
Description and required action as published by CISA. Full record at NVD.
Other Fortinet entries on the list
- Multiple Products Fortinet Multiple Products Path Traversal Vulnerability CVE-2025-61624 · Oct 16, 2026
- FortiMail Fortinet FortiMail Path Traversal Vulnerability CVE-2026-104286 · Oct 1, 2026
- Multiple Products Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability CVE-2025-25249 · Sep 9, 2026
- FortiOS Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability CVE-2025-68686 · Jul 27, 2026
- FortiSandbox Fortinet FortiSandbox OS Command Injection Vulnerability CVE-2026-39808 · Jul 16, 2026
- FortiSandbox Fortinet FortiSandbox OS Command Injection Vulnerability CVE-2026-25089 · Jul 16, 2026