CVE-2026-34578

HIGH

8.2

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.

Details CVE

Score CVSS v3.18.2

SeveriteHIGH

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurNONE

Publie4/9/2026

Derniere modification4/14/2026

Sourcenvd

Observations honeypot0

Produits affectes

opnsense:opnsense

Faiblesses (CWE)

CWE-90

References

https://github.com/opnsense/core/commit/016f66cb4620cd48183fa97843f343bb71813c6e(security-advisories@github.com)

https://github.com/opnsense/core/security/advisories/GHSA-jpm7-f59c-mp54(security-advisories@github.com)

https://github.com/opnsense/core/security/advisories/GHSA-jpm7-f59c-mp54(134c704f-9b21-4f2e-91b3-4a467353bcc0)

Correlations IOC

Aucune correlation enregistree

This product uses data from the NVD API but is not endorsed or certified by the NVD.