CVE-2026-34578

Published: Apr 09, 2026 Last Modified: Apr 14, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 8,2
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: low
Availability: none

Description

AI Translation Available

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.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0020
Percentile
0,4th
Updated

EPSS Score Trend (Last 7 Days)

90

Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality Integrity Availability
Potential Impacts:
Execute Unauthorized Code Or Commands Read Application Data Modify Application Data
Applicable Platforms
Technologies: Database Server
View CWE Details
Application

Opnsense by Opnsense

Product Information
Vendor Opnsense
Product Opnsense
Version Range Affected
To 26.1.6 (exclusive)
cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://github.com/opnsense/core/security/advisories/GHSA-j…
https://github.com/opnsense/core/security/advisories/GHSA-jpm7-f59c-mp54
https://github.com/opnsense/core/commit/016f66cb4620cd48183…
https://github.com/opnsense/core/commit/016f66cb4620cd48183fa97843f343bb71813c6e
https://github.com/opnsense/core/security/advisories/GHSA-j…
https://github.com/opnsense/core/security/advisories/GHSA-jpm7-f59c-mp54