Fortinet FortiAuthenticator up to 6.6.10/8.0.3 hard-coded password

Summaryinfo

A vulnerability identified as very critical has been detected in Fortinet FortiAuthenticator up to 6.6.10/8.0.3. Affected by this vulnerability is an unknown functionality. Performing a manipulation results in hard-coded password. This vulnerability is known as CVE-2026-126257. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as very critical has been found in Fortinet FortiAuthenticator up to 6.6.10/8.0.3. This affects some unknown functionality. The manipulation with an unknown input leads to a hard-coded password vulnerability. CWE is classifying the issue as CWE-259. The product contains a hard-coded password, which it uses for its own inbound authentication or for outbound authentication to external components. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at fortiguard.fortinet.com. This vulnerability is uniquely identified as CVE-2026-126257 since 11/10/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/11/2026). The attack technique deployed by this issue is T1078.001 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Fortinet

Name

• FortiAuthenticator

Version

• 6.6.0
• 6.6.1
• 6.6.2
• 6.6.3
• 6.6.4
• 6.6.5
• 6.6.6
• 6.6.7
• 6.6.8
• 6.6.9
• 6.6.10
• 8.0.0
• 8.0.1
• 8.0.2
• 8.0.3

License

• commercial

Website

• Vendor: https://www.fortinet.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

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