FortiAuthenticator <=8.0.3 & <=6.6.10 External Format String RCE
CVE-2026-126247 Published on November 11, 2026

A use of externally-controlled format string vulnerability in Fortinet FortiAuthenticator 8.0.0 through 8.0.3, FortiAuthenticator 6.6.0 through 6.6.10 may allow an authenticated privileged attacker to execute unauthorized code or commands via http requests.

NVD

Vulnerability Analysis

CVE-2026-126247 can be exploited with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
HIGH
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

Use of Externally-Controlled Format String

The software uses a function that accepts a format string as an argument, but the format string originates from an external source.


Products Associated with CVE-2026-126247

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Fortinet Fortiauthenticator

Affected Versions

Fortinet FortiAuthenticator: