Authentication bypass by primary weakness in FortiOS - CVE-2026-22153
Published: February 10, 2026
Vulnerability identifier: #VU122532
CSH Severity: High
CVSS v4.0: 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
CVE-ID: CVE-2026-22153
CWE-ID: CWE-305
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Fortinet, Inc
Affected software:
FortiOS
FortiOS
Detailed vulnerability description
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.
How to mitigate CVE-2026-22153
Install updates from vendor's website.