CVE-2026-24858
Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
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.
CISA 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
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.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:CExploitation Context
as of October 13, 2026- CISA added CVE-2026-24858 to the KEV catalog on the day its CVE record was published. The median for entries added in 2026 so far is 15 days.
- It is one of 31 Fortinet entries in the CISA KEV catalog, and one of 8 added in 2026.
- Its current EPSS score (85.8%) is higher than that of 68% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Fortinet | Fortinet FortiWeb | 8.0.0 to 8.0.3 7.6.0 to 7.6.6 7.4.0 to 7.4.11 |
| Fortinet | Fortinet FortiNAC-F | 7.6.3 to 7.6.5 |
| Fortinet | Fortinet FortiOS | 7.6.0 to 7.6.5 7.4.0 to 7.4.10 7.2.0 to 7.2.12 7.0.0 to 7.0.18 |
| Fortinet | Fortinet FortiAnalyzer | 7.6.0 to 7.6.5 7.4.0 to 7.4.9 7.2.0 to 7.2.11 7.0.0 to 7.0.15 |
| Fortinet | Fortinet FortiProxy | 7.6.0 to 7.6.4 7.4.0 to 7.4.12 7.2.0 to 7.2.15 7.0.0 to 7.0.22 |
| Fortinet | Fortinet FortiManager | 7.6.0 to 7.6.5 7.4.0 to 7.4.9 7.2.0 to 7.2.11 7.0.0 to 7.0.15 |
References
1 LinksRecord Details
More from Fortinet
Fortinet Multiple Products Authentication Bypass Vulnerability
Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
Fortinet Multiple Products Format String Vulnerability
Fortinet Multiple Products Stack-Based Buffer Overflow Vulnerability
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Tool categories
CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.