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CVE-2026-34578

8.2 · HIGH

OPNsense is a FreeBSD based firewall and routing platform.

Published Apr 9, 2026CWE-90EPSS 0.48%

Overview

CVE-2026-34578 is a high-severity vulnerability. It was published on April 9, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/opnsense/core/commit/016f66cb4620cd48183fa97843f343bb71813c6eGitHubgithub.com/opnsense/core/security/advisories/GHSA-jpm7-f59c-mp54GitHubgithub.com/opnsense/core/security/advisories/GHSA-jpm7-f59c-mp54

How CyberStrike helps

Frequently asked questions

What is CVE-2026-34578?

CVE-2026-34578 is a high-severity vulnerability. It was published on April 9, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-34578?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-34578?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-34578?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-34578 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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