CVE-2026-55106
authentik: Unauthenticated LDAP directory data disclosure
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.
INFO
Published Date :
Aug. 18, 2026, 5:16 p.m.
Last Modified :
Oct. 22, 2026, 10:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update Authentik to version 2026.2.6 or later.
- Update Authentik to version 2026.5.5 or later.
- Ensure an LDAP Source is configured to trigger this vulnerability.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-55106.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-55106 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-55106
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-55106 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-55106 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Oct. 22, 2026
Action Type Old Value New Value Added Translation Title: authentik de goauthentik, Description: authentik es un proveedor de identidad de código abierto. Antes de 2026.2.6 y 2026.5.5, una acción de diagnóstico en la API de origen LDAP no aplica el filtro de autorización de lectura a nivel de objeto utilizado por el resto de la API. Cualquier parte capaz de alcanzar la API, incluyendo un cliente no autenticado, puede invocar la acción de diagnóstico contra un origen LDAP configurado. El servidor luego se conecta al directorio ascendente utilizando las credenciales de enlace configuradas del origen y devuelve un conjunto limitado de entradas de directorio. La respuesta expone los nombres distinguidos de esas entradas y los nombres de los atributos presentes en ellas, revelando la estructura del directorio, las convenciones de nomenclatura y la existencia de cuentas y grupos específicos, pero no los valores de los atributos. Las implementaciones sin un origen LDAP configurado no se ven afectadas. Este problema está solucionado en las versiones 2026.2.6 y 2026.5.5. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 18, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-55106', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-18T19:07:03.199464Z'} -
New CVE Received by [email protected]
Aug. 18, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'goauthentik', 'product': 'authentik', 'versions': [{'status': 'affected', 'version': '< 2026.2.6'}, {'status': 'affected', 'version': '>= 2026.5.0, < 2026.5.5'}]}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Added CWE CWE-862 Added Reference https://github.com/goauthentik/authentik/commit/e638de23217480854ec5e48ca6fceae479321f99 Added Reference https://github.com/goauthentik/authentik/commit/fc336da4bd32bef52800c77d91aa0b82c5533041 Added Reference https://github.com/goauthentik/authentik/pull/24055 Added Reference https://github.com/goauthentik/authentik/pull/24060 Added Reference https://github.com/goauthentik/authentik/releases/tag/version/2026.2.6 Added Reference https://github.com/goauthentik/authentik/releases/tag/version/2026.5.5 Added Reference https://github.com/goauthentik/authentik/security/advisories/GHSA-h8ff-c3h7-2gf8