CVE-2026-24858: Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability

Required action (CISA's text)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Description (NVD)

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.

SOURCES

• CISA KEVCISA Known Exploited Vulnerabilities catalog

Other Fortinet flaws

• CVE-2025-61624: Fortinet Multiple Products Path Traversal Vulnerability
• CVE-2026-104286: Fortinet FortiMail Path Traversal Vulnerability
• CVE-2025-25249: Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
• CVE-2025-68686: Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability
• CVE-2026-39808: Fortinet FortiSandbox OS Command Injection Vulnerability

Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.