High [CVE-2026-22153] LDAP authentication bypass in Agentless VPN and FSSO
This high-severity Fortinet advisory covers CVE-2026-22153 affecting FortiOS.
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Summary
CVSSv3 Score:
7.5
An Authentication Bypass by Primary Weakness vulnerability [CWE-305] in FortiOS fnbamd may allow an unauthenticated attacker to bypass LDAP authentication of Agentless VPN or FSSO policy, under specific LDAP server configuration.
Revised on 2026-07-04 00:00:00
- FortiOS 7.6: 7.6.0 through 7.6.4
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- FortiOS 7.6: 7.6.5
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Upgrade per the Affected/Solution table: FortiOS 7.6: 7.6.5.
- Disable unauthenticated bind on the LDAP server.
- For example, LDAP unauthenticated binds can be disabled in Windows Active Directory (starting from Windows Server 2019) via the following PowerShell code snippet:
- $configDN = (Get-ADRootDSE).configurationNamingContext$dirSvcDN = "CN=Directory Service,CN=Windows NT,CN=Services,$configDN"Set-ADObject -Identity $dirSvcDN -Add @{'msDS-Other-Settings'='DenyUnauthenticatedBind=1'}
- Virtual Patch named "FG-VD-10009566.0day." is available in FMWP db update 26.063
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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