CVE-2026-24858
Published 2026-01-27 · Updated 2026-06-17 · Source psirt@fortinet.com
Summary
CVE-2026-24858 is a critical-severity (CVSS 9.8) vulnerability in Fortinet Multiple Products. CISA added it to the Known Exploited Vulnerabilities catalog on January 27, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by January 30, 2026. CISA does not currently list it as used in ransomware campaigns. Fortinet has 32 vulnerabilities in the KEV catalog, 14 of them linked to ransomware.
All 32 known-exploited Fortinet vulnerabilities →Description
An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] vulnerability in Fortinet FortiAnalyzer 7.6.0 through 7.6.5, FortiAnalyzer 7.4.0 through 7.4.9, FortiAnalyzer 7.2.0 through 7.2.11, FortiAnalyzer 7.0.0 through 7.0.15, FortiManager 7.6.0 through 7.6.5, FortiManager 7.4.0 through 7.4.9, FortiManager 7.2.0 through 7.2.11, FortiManager 7.0.0 through 7.0.15, FortiNAC-F 7.6.3 through 7.6.5, FortiOS 7.6.0 through 7.6.5, FortiOS 7.4.0 through 7.4.10, FortiOS 7.2.0 through 7.2.12, FortiOS 7.0.0 through 7.0.18, FortiProxy 7.6.0 through 7.6.4, FortiProxy 7.4.0 through 7.4.12, FortiProxy 7.2.0 through 7.2.15, FortiProxy 7.0.0 through 7.0.22, FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11 may 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.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA Known-Exploited Vulnerability
Product: Fortinet — Multiple Products
Name: Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
Date added: 2026-01-27 · Due: 2026-01-30
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.