SB2026021041 - LDAP authentication bypass in FortiOS
Published: February 10, 2026
Security Bulletin ID
SB2026021041
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Authentication bypass by primary weakness (CVE-ID: CVE-2026-22153)
CWE-ID: CWE-305 - Authentication Bypass by Primary Weakness
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:U/U:Amber
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.