CVE-2026-126257 Hardcoded credentials in FortiAuthenticator
A hard-coded password in FortiAuthenticator may let unauthenticated attackers bypass credential checks and gain unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Harmful if only installed
- Yes
- Needs a specific call
- No
- Fix
- None listed
What is CVE-2026-126257?
CVE-2026-126257 is a critical hardcoded credentials vulnerability in Fortinet FortiAuthenticator, published on 11 Nov 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A use of hard-coded password vulnerability in Fortinet FortiAuthenticator 8.0.0 through 8.0.3, FortiAuthenticator 6.6.0 through 6.6.10 may allow an unauthenticated attacker to bypass credential validation in certain circumstances outside of the attacker's control and gain unauthorized access.
Weakness: CWE-259
Which versions are affected by CVE-2026-126257?
Having an affected version installed is enough. The problem is in what it ships or how it installs, so no code has to call it.
How do I fix CVE-2026-126257?
No fix has been published for CVE-2026-126257 yet. Limit exposure of the affected software until one is available.
Upgrade, then change or revoke the exposed credential wherever it is used. More about Hardcoded credentials.
Is CVE-2026-126257 being exploited?
There is no known exploitation of CVE-2026-126257 in the wild and no public exploit code.
Sources
Also known as GHSA-3jjw-p738-9hj8.