Is CVE-2026-126247 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-126247 being exploited in the wild.

How severe is CVE-2026-126247?

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-2026-126247?

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-2026-126247 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-126247?

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-2026-126247: Fortinet FortiAuthenticator format string code execution

CVE-2026-126247 · Severity: high · CVSS 7.2 · Published 2026-11-11

FortiAuthenticator is an authentication server used by enterprises to manage user access and credentials. A format string vulnerability in the HTTP API allows authenticated administrators to execute arbitrary code on the server, potentially leading to complete system compromise and unauthorized access to corporate authentication infrastructure.

Technologies: Fortinet FortiAuthenticator. Vendors: Fortinet.

Quick answers

Is CVE-2026-126247 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-126247 being exploited in the wild.
How severe is CVE-2026-126247?: 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-2026-126247?: 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-2026-126247 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-126247?: 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

A format string vulnerability (CWE-134) in FortiAuthenticator's API component allows an authenticated privileged attacker to execute code via crafted HTTP requests. The vulnerability affects versions 8.0.0–8.0.3 and 6.6.0–6.6.10. Exploitation requires valid administrator credentials and network access to the API endpoint.

Affected products

Fortinet FortiAuthenticator 8.0.0 through 8.0.3, 6.6.0 through 6.6.10

Timeline

2026-11-10: disclosed

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-261

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