CVE-2026-55106 authentik: Unauthenticated LDAP directory data disclosure
Unauthenticated attackers can access LDAP directory structure and account existence via a diagnostic API endpoint lacking authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55106?
CVE-2026-55106 is a medium-severity missing authorization vulnerability in goauthentik authentik, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-55106?
1 open source package ship an affected version, including authentik.
| Package | Affected | Fixed in |
|---|---|---|
authentik Bitnami | All versions | 2026.2.6, 2026.5.5 |
How do I fix CVE-2026-55106?
Upgrade authentik to a fixed version for your release line: 2026.2.6 or 2026.5.5.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-55106 being exploited?
There is no known exploitation of CVE-2026-55106 in the wild and no public exploit code.
Sources
Also known as BIT-authentik-2026-55106, GHSA-h8ff-c3h7-2gf8.