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Vulnerabilities

CVE-2026-34578 | BDVDB-2026-326102 Detail

opnsensecore

Description#

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact low, availability impact none. Attack vector: network.

Weaknesses#

  • CWE-90 Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

References#

Exploit#

No public exploit known

History#

  1. Version 1Record published in the CVE List.