Quick answers
- Is CVE-2026-126257 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-126257 being exploited in the wild.
- How severe is CVE-2026-126257?
- Critical severity, with a CVSS score of 9, 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-2026-126257?
- 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-2026-126257 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-126257?
- 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 use of hard-coded password vulnerability (CWE-259) in FortiAuthenticator's credential validation mechanism allows unauthenticated attackers to bypass authentication under certain circumstances and gain unauthorized access. The vulnerability affects versions 8.0.0–8.0.3 and 6.6.0–6.6.10. Exploitation requires no authentication or user interaction, presenting a critical risk to organizations relying on this product for centralized authentication.
Affected products
- Fortinet FortiAuthenticator 8.0.0 through 8.0.3, 6.6.0 through 6.6.10
Timeline
- 2026-11-10: disclosed