CVEvulnerability

CVE-2026-24858

9.8 CRITICAL Known exploited Published 2026-01-27 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability — Fortinet Multiple Products

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.

Added to KEV: 2026-01-27
Remediation due: 2026-01-30
Ransomware use: Unknown
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.
Notes: Please adhere to Fortinet's guidelines to assess exposure and mitigate risks. Check for signs of potential compromise on all internet accessible Fortinet products affected by this vulnerability. Apply any final mitigations provided by the vendor as soon as they become available. For more information please see: https://fortiguard.fortinet.com/psirt/FG-IR-26-060 ; https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios ; https://nvd.nist.gov/vuln/detail/CVE-2026-24858

Status: Analyzed
Published: 2026-01-27
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 ([email protected]): 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses: CWE-288

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.

Affected configurations

• fortinet fortianalyzer (>= 7.0.0 <= 7.0.15) • fortinet fortianalyzer (>= 7.2.0 <= 7.2.11) • fortinet fortianalyzer (>= 7.4.0 < 7.4.10) • fortinet fortianalyzer (>= 7.6.0 < 7.6.6) • fortinet fortimanager (>= 7.0.0 <= 7.0.15) • fortinet fortimanager (>= 7.2.0 <= 7.2.11) • fortinet fortimanager (>= 7.4.0 < 7.4.10) • fortinet fortimanager (>= 7.6.0 < 7.6.6) • fortinet fortinac-f (>= 7.6.3 < 7.6.6) • fortinet fortiproxy (>= 7.0.0 <= 7.0.22) • fortinet fortiproxy (>= 7.2.0 <= 7.2.15) • fortinet fortiproxy (>= 7.4.0 <= 7.4.12) • fortinet fortiproxy (>= 7.6.0 <= 7.6.4) • fortinet fortiweb (>= 7.4.0 <= 7.4.11) • fortinet fortiweb (>= 7.6.0 <= 7.6.6) • fortinet fortiweb (>= 8.0.0 <= 8.0.3) • fortinet fortios (>= 7.0.0 <= 7.0.18) • fortinet fortios (>= 7.2.0 <= 7.2.12) • fortinet fortios (>= 7.4.0 < 7.4.11) • fortinet fortios (>= 7.6.0 < 7.6.6) • siemens ruggedcom ape1808 firmware

Weakness · CWE (1)

CWE-288 Authentication Bypass Using an Alternate Path or Channel weakness

References