# CVE-2026-126238: Fortinet FortiAuthenticator incorrect authorization in REST API

Source: https://junglewise.ai/threats/cve-2026-126238-a-incorrect-authorization-vulnerability-in-fortinet  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-11. Updated: 2026-11-11  
License: CC BY 4.0 with a link back

CVE-2026-126238 · Severity: high · CVSS 8.6 · Published 2026-11-11

FortiAuthenticator is an authentication and authorization platform used to secure access to corporate networks and applications. An unauthenticated attacker can bypass authorization checks in the REST API to gain unauthorized access to restricted administrative functionality, potentially leading to account compromise or system misconfiguration.

Technologies: [Fortinet FortiAuthenticator](https://junglewise.ai/threats/technologies/fortiauthenticator). Vendors: [Fortinet](https://junglewise.ai/threats/vendors/fortinet).

## Quick answers

**Is CVE-2026-126238 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-126238 being exploited in the wild.

**How severe is CVE-2026-126238?** High severity, with a CVSS score of 8.6, published 11 November 2026.

**Which products and versions are affected?** Fortinet FortiAuthenticator 8.0.0 through 8.0.3, 6.6.0 through 6.6.10.

**Is there a fix for CVE-2026-126238?** Yes: fixed in FortiAuthenticator 8.0.4 or above, 6.6.11 or above. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-126238 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-126238?** Check whether you run Fortinet FortiAuthenticator at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in FortiAuthenticator 8.0.4 or above, 6.6.11 or above

## Technical details

An incorrect authorization vulnerability (CWE-863) in the REST API of FortiAuthenticator allows unauthenticated attackers to bypass authorization checks. The attack requires no authentication, credentials, or user interaction and grants access to restricted functionality. A fix is available in FortiAuthenticator 8.0.4 and 6.6.11.

## Affected products

- Fortinet FortiAuthenticator 8.0.0 through 8.0.3, 6.6.0 through 6.6.10

## Timeline

- 2026-11-10: disclosed: Fortinet PSIRT publication

## References

- [https://fortiguard.fortinet.com/psirt/FG-IR-26-253](https://fortiguard.fortinet.com/psirt/FG-IR-26-253)

## Related threats

- [Fortinet FortiAuthenticator hard-coded password authentication bypass](https://junglewise.ai/threats/cve-2026-126257-a-use-of-hard-coded-password-vulnerability-in-fortinet)
- [Fortinet FortiAuthenticator SQL injection](https://junglewise.ai/threats/cve-2026-126252-a-improper-neutralization-of-special-elements-used-in-an-sql)
- [Fortinet FortiAuthenticator incorrect authorization](https://junglewise.ai/threats/cve-2026-126251-a-incorrect-authorization-vulnerability-in-fortinet)
- [Fortinet FortiAuthenticator authorization bypass DoS](https://junglewise.ai/threats/cve-2026-126250-a-incorrect-authorization-vulnerability-in-fortinet)
- [Fortinet FortiAuthenticator privilege escalation in GUI](https://junglewise.ai/threats/cve-2026-126249-a-improper-privilege-management-vulnerability-in-fortinet)