LDAP injection in FortiAuthenticator - CVE-2026-126240
Published: November 11, 2026
Vulnerability identifier: #VU165208
CSH Severity: Medium
CVSS v4: 7.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-126240
CWE-ID: CWE-90
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote authenticated user to read and manipulate data.
The vulnerability exists due to improper neutralization of special elements used in an ldap query ('ldap injection'). An authenticated attacker can bypass authentication. Successful exploitation requires either a malicious/compromised upstream IdP, or an IdP configuration that allows the user to control the NameID (or the SAML attribute used as the username).
Affected software
FortiAuthenticator
How to mitigate CVE-2026-126240
Install update from vendor's website.
FortiAuthenticator - addressed in versions 6.6.11, 8.0.4