CVE-2026-24858
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.
CISA KEV
- Vendor
- Fortinet
- Product
- Multiple Products
- Due date
- 2026-01-30
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: cisa-kev — 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
Vendor advisory: 134c704f-9b21-4f2e-91b3-4a467353bcc0 — https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios
Vendor advisory: psirt@fortinet.com — https://fortiguard.fortinet.com/psirt/FG-IR-26-060
Exploits
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| fortinet | fortianalyzer | {"startIncluding":"7.0.0","endIncluding":"7.0.15"} | |
| fortinet | fortimanager | {"startIncluding":"7.0.0","endIncluding":"7.0.15"} | |
| fortinet | fortiproxy | {"startIncluding":"7.0.0","endIncluding":"7.0.22"} | |
| fortinet | fortiweb | {"startIncluding":"7.4.0","endIncluding":"7.4.11"} | |
References
- https://fortiguard.fortinet.com/psirt/FG-IR-26-060
- https://cert-portal.siemens.com/productcert/html/ssa-975644.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24858
- https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios
- 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
CWEs
CWE-288
Verify integrity in audit chain (admin only). AS-IS.