OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.6, OPNsense's LDAP authentication connector passes the login username directly into an LDAP search filter without calling ldap_escape(). An unauthenticated attacker can inject LDAP filter metacharacters into the username field of the WebGUI login page to enumerate valid LDAP usernames in the configured directory. When the LDAP server configuration includes an Extended Query to restrict login to members of a specific group, the same injection can be used to bypass that group membership restriction and authenticate as any LDAP user whose password is known, regardless of group membership. This vulnerability is fixed in 26.1.6.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/opnsense/core/commit/016f66cb4620cd48183fa97843f343bb71813c6e Patch
- https://github.com/opnsense/core/security/advisories/GHSA-jpm7-f59c-mp54 Exploit, Mitigation, Vendor Advisory
- https://github.com/opnsense/core/security/advisories/GHSA-jpm7-f59c-mp54 Exploit, Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.2 · opnsenseNVD modified 2026-10-26 22:10
Affected (CPE criteria) 1
cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:*
References 3
- https://github.com/opnsense/core/commit/016f66cb4620cd48183fa97843f343bb71813c6e Patch
- https://github.com/opnsense/core/security/advisories/GHSA-jpm7-f59c-mp54 Exploit, Mitigation, Vendor Advisory
- https://github.com/opnsense/core/security/advisories/GHSA-jpm7-f59c-mp54 Exploit, Mitigation, Vendor Advisory