# CVE-2026-126243: Fortinet FortiAuthenticator incorrect authorization

Source: https://junglewise.ai/threats/cve-2026-126243-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-2026-126243 · Severity: high · CVSS 7.2 · Published 2026-11-11

FortiAuthenticator is an authentication and identity management system that protects access to corporate resources. An incorrect authorization flaw allows attackers to bypass authentication checks in the API, potentially gaining unauthorized access to accounts. Attackers still need to obtain certain identifiers and data through other means to fully impersonate a user.

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

## Quick answers

**Is CVE-2026-126243 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-126243 being exploited in the wild.

**How severe is CVE-2026-126243?** High severity, with a CVSS score of 7.2, 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-2026-126243?** Yes: fixed in FortiAuthenticator 8.0.4 or above; FortiAuthenticator 6.6.11 or above. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-126243 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-126243?** 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; FortiAuthenticator 6.6.11 or above

## Technical details

An incorrect authorization vulnerability (CWE-863) in the FortiAuthenticator API allows authentication bypass via improper access control checks. The vulnerability affects versions 8.0.0–8.0.3 and 6.6.0–6.6.10 and can be exploited without prior authentication, though full account impersonation requires the attacker to obtain pre-requisite identifiers and data from external sources.

## Affected products

- Fortinet FortiAuthenticator 8.0.0 through 8.0.3, 6.6.0 through 6.6.10

## Timeline

- 2026-11-10: disclosed
- 2026-11-11: advisory

## References

- [https://fortiguard.fortinet.com/psirt/FG-IR-26-257](https://fortiguard.fortinet.com/psirt/FG-IR-26-257)

## 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)