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.

CVE-2026-126243: Fortinet FortiAuthenticator incorrect authorization

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. 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

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