CVE-2026-24858
Authentication Bypass Using an Alternate Path or Channel in Fortinet Multiple Products. CISA confirmed attackers exploit it and added it to its Known Exploited Vulnerabilities catalog on 27 January 2026.
- Product
- Fortinet Multiple Products
- Added to CISA's catalog
- Federal fix-by date
- Ransomware
- No known use in ransomware campaigns
- Vendor advisories
- Sources
- CISA’s catalog, NVD entry
CISA’s description.
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.
More from Fortinet this year.
- CVE-2025-61624 Path Traversal, added
- CVE-2026-104286 Path Traversal, added
- CVE-2025-25249 Heap-based Buffer Overflow, added
- CVE-2025-68686 Exposure of Sensitive Information to an Unauthorized Actor, added
- CVE-2026-39808 OS Command Injection, added
- CVE-2026-25089 OS Command Injection, added
- CVE-2026-21643 SQL Injection, added
- CVE-2026-35616 Improper Access Control, added
Every flaw CISA confirmed exploited in the last 30 days is on the exploit watch. This is not security advice. Check the vendor’s advisory before acting. From CISA’s catalog of 4 November 2026.