Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
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
What happened
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.
CISA lists it as exploited, added 27 Jan 2026.
Does it affect you
Names Fortinet FortiGate (FortiOS). Enter the product and version you run to place it against the affected range the vendor published.
What to do
- Follow the vendor advisory for the fixed release and any interim mitigation.
fortiguard.fortinet.com - Follow the vendor advisory for the fixed release and any interim mitigation.
fortinet.com - Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
cisa.gov
CISA’s notes for this entry:
- 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: fortiguard.fortinet.com/psirt/FG-IR-26-060
- fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios
- nvd.nist.gov/vuln/detail/CVE-2026-24858
Affected, as published to NVD
- forti-os
- Fortinet FortiGate (FortiOS): 7.0.0 up to and including 7.0.22
The record
- NVD status
- Analyzed
- Published
- 27 Jan 2026, last modified 17 Jun 2026 (NVD)
- Severity
- CVSS 3.1 base score 9.8, Critical — computed here from the vector; NVD states 9.8.
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness
- CWE-288 Authentication Bypass Using an Alternate Path or Channel (NVD; names by MITRE)
- Exploitation
- Listed in CISA’s Known Exploited Vulnerabilities catalogue since 27 Jan 2026; federal remediation due 30 Jan 2026. CISA entry
- Exploit probability
- EPSS 85.8%, 100th percentile — FIRST, scored 23 Oct 2026. FIRST EPSS
- Vendor
- Fortinet · Multiple Products (CISA)
References on the NVD record
- fortiguard.fortinet.com/psirt/FG-IR-26-060Vendor Advisory
- fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortiosMitigationVendor Advisory
- cert-portal.siemens.com/productcert/html/ssa-975644.htmlThird Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24858US Government Resource
Sources
The verdict above is computed from the products and versions you entered and the affected ranges the vendor published to NVD. It does not inspect your environment, and this site never reports a product as unaffected: why.