Is this vulnerability remotely exploitable over the network?

Yes. Any actor who can reach the OPNsense WebGUI over the network can send crafted usernames to the LDAP-backed login endpoint, making the attack remotely exploitable within the management interface's exposure.

Does exploitation require valid credentials or prior access?

No. Username enumeration and filter manipulation attempts can be performed without prior authentication. However, to complete an authentication bypass, the attacker must know the correct password for a target LDAP account.

What is the safest general fix pattern for this class of bug?

The most robust fix is to stop concatenating raw user input into LDAP filters and instead treat all input as data: always apply standardized LDAP escaping functions to user-supplied values and, where possible, use helper APIs that construct filters with fixed syntax and parameterized values.

Severity:

HIGH RISK

(8.2)

LDAP Injection (CWE-90) in OPNsense LDAP Authentication Connector

CVE-2026-34578

Published:

Apr 9, 2026

Status:

Received

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI Handler setAccessDeviceCfg

Remote Code Execution on the Router

April 12, 2026

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI setLedCfg Handler

Remote Code Execution on the Router

April 12, 2026

Vulnerability Type

Category:

LDAP Injection

CWE:

CWE-90

Impact:

Authentication Bypass and User Enumeration

Severity:

HIGH RISK

(8.2)

CVSS Version:

3.1

Vulnerability Type

Category:

LDAP Injection

CWE:

CWE-90

Impact:

Authentication Bypass and User Enumeration

Severity:

HIGH RISK

(8.2)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

LDAP Injection (CWE-90) in OPNsense LDAP Authentication Connector

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI Handler setAccessDeviceCfg

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI setLedCfg Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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