Quick answers
- Is CVE-2026-126251 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-126251 being exploited in the wild.
- How severe is CVE-2026-126251?
- Critical severity, with a CVSS score of 9.1, 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-2026-126251?
- 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-2026-126251 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-126251?
- 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 FortiAuthenticator API permits unauthenticated attackers to bypass authentication mechanisms. The flaw affects versions 8.0.0–8.0.3 and 6.6.0–6.6.10, allowing privilege escalation through the unauthenticated API attack vector. Patches are available in versions 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
- 2026-11-11: advisory