CVE-2026-24858
critical
KEV
CVSS v3
9.8
CVSS v4 NEW
—
VIR risk
10.0
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
Exploit likelihood
99%
Patch ETA
—
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}
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
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
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.