Is CVE-2026-126245 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-126245 being exploited in the wild.

How severe is CVE-2026-126245?

High severity, with a CVSS score of 8.1, 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-2026-126245?

Yes: fixed in FortiAuthenticator 8.0.4, 6.6.11. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-126245 attacked?

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

Am I affected by CVE-2026-126245?

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-2026-126245: Fortinet FortiAuthenticator out-of-bounds write in API

CVE-2026-126245 · Severity: high · CVSS 8.1 · Published 2026-11-11

Fortinet FortiAuthenticator is an authentication server that manages user access and credentials for enterprise networks. An unauthenticated attacker can send specially crafted HTTP requests to trigger an out-of-bounds memory write in the API, potentially executing arbitrary code on the server if address space layout randomization (ASLR) can be defeated. This could lead to complete system compromise and unauthorized access to all authenticated user data.

Technologies: Fortinet FortiAuthenticator. Vendors: Fortinet.

Quick answers

Is CVE-2026-126245 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-126245 being exploited in the wild.
How severe is CVE-2026-126245?: High severity, with a CVSS score of 8.1, 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-2026-126245?: Yes: fixed in FortiAuthenticator 8.0.4, 6.6.11. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-126245 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-126245?: 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, 6.6.11

Technical details

An out-of-bounds write vulnerability (CWE-787) in the FortiAuthenticator API allows unauthenticated remote code execution via HTTP requests, contingent on bypassing ASLR protections. The vulnerability affects versions 8.0.0–8.0.3 and 6.6.0–6.6.10; patches are available in 8.0.4+ and 6.6.11+. No active exploitation in the wild has been reported.

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-26-259

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