SB2026021041 - LDAP authentication bypass in FortiOS 



SB2026021041 - LDAP authentication bypass in FortiOS

Published: February 10, 2026

Security Bulletin ID SB2026021041
Severity
High
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Authentication bypass by primary weakness (CVE-ID: CVE-2026-22153)

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in fnbamd. A remote non-authenticated attacker can bypass LDAP authentication in Agentless VPN and FSSO and gain unauthorized access to the network. 


Remediation

Install update from vendor's website.