CVE-2026-126240

EUVD-2026-123879

11.11.2026, 22:17

A improper neutralization of special elements used in an ldap query ('ldap injection') vulnerability in Fortinet FortiAuthenticator 8.0.0 through 8.0.3, FortiAuthenticator 6.6.0 through 6.6.10 may allow an authenticated attacker to 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).

LDAP Injection

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
fortinet	CNA	8.2 HIGH	NETWORK	HIGH	LOW	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).

Vendor	Product	Version	Source
fortinet	fortiauthenticator	8.0.0 ≤ 𝑥 ≤ 8.0.3	CNA
fortinet	fortiauthenticator	6.6.0 ≤ 𝑥 ≤ 6.6.10	CNA

Common Weakness Enumeration

CWE-90 - Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
The software constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query when it is sent to a downstream component.

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-255