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CVE-2026-55106

5.3 · MEDIUM

authentik is an open-source identity provider.

Published Aug 18, 2026CWE-862EPSS 0.44%

Overview

CVE-2026-55106 is a medium-severity vulnerability. It was published on August 18, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

authentik is an open-source identity provider. Prior to 2026.2.6 and 2026.5.5, a diagnostic action on the LDAP Source API does not enforce the object-level read-authorization filter used by the rest of the API. Any party able to reach the API, including an unauthenticated client, can invoke the diagnostic action against a configured LDAP Source. The server then connects to the upstream directory using the source's configured bind credentials and returns a bounded set of directory entries. The response exposes the distinguished names of those entries and the names of the attributes present on them, revealing directory structure, naming conventions, and the existence of specific accounts and groups, but not attribute values. Deployments without a configured LDAP Source are not affected. This issue is fixed in versions 2026.2.6 and 2026.5.5.

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/goauthentik/authentik/commit/e638de23217480854ec5e48ca6fceae479321f99GitHubgithub.com/goauthentik/authentik/commit/fc336da4bd32bef52800c77d91aa0b82c5533041GitHubgithub.com/goauthentik/authentik/pull/24055GitHubgithub.com/goauthentik/authentik/pull/24060GitHubgithub.com/goauthentik/authentik/releases/tag/version/2026.2.6GitHubgithub.com/goauthentik/authentik/releases/tag/version/2026.5.5GitHubgithub.com/goauthentik/authentik/security/advisories/GHSA-h8ff-c3h7-2gf8

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55106?

CVE-2026-55106 is a medium-severity vulnerability. It was published on August 18, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-55106?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-55106?

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-2026-55106?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55106 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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