CVE-2026-55106

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 84% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

August 18, 2026

Last Modified

August 18, 2026

Advisory Details (5)

Auto-updated Aug 18, 2026
Patch available. Sources: github_commit, github_pr, github.
github Patch Available

LDAP Source debug endpoint accessible without authorization · Advisory · goauthentik/authentik · GitHub

https://github.com/goauthentik/authentik/security/advisories/GHSA-h8ff-c3h7-2gf8
github_pr

security: automated internal backport of patch 1887.sec.patch to authentik-2026.5

Fix merged in goauthentik/authentik PR #24060 on 2026-07-15 — awaiting tagged release

https://github.com/goauthentik/authentik/pull/24060
github_pr

security: automated internal backport of patch 1887.sec.patch to authentik-2026.2

Fix merged in goauthentik/authentik PR #24055 on 2026-07-15 — awaiting tagged release

https://github.com/goauthentik/authentik/pull/24055
github_commit

commit fc336da4bd32 (goauthentik/authentik)

Fix landed in goauthentik/authentik commit fc336da4bd32 — awaiting tagged release

https://github.com/goauthentik/authentik/commit/fc336da4bd32bef52800c77d91aa0b82c5533041
github_commit

commit e638de232174 (goauthentik/authentik)

Fix landed in goauthentik/authentik commit e638de232174 — awaiting tagged release

https://github.com/goauthentik/authentik/commit/e638de23217480854ec5e48ca6fceae479321f99

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 25× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-30 02:02 UTCEG score recompute
  2. 2026-08-30 01:22 UTCEPSS rescore
  3. 2026-08-29 03:49 UTCEG score recompute
  4. 2026-08-28 21:41 UTCEPSS rescore
  5. 2026-08-28 02:24 UTCEG score recompute
  6. 2026-08-27 14:25 UTCEPSS rescore
  7. 2026-08-27 04:12 UTCEG score recompute
  8. 2026-08-26 14:46 UTCEPSS rescore
  9. 2026-08-26 06:00 UTCEG score recompute
  10. 2026-08-25 13:49 UTCEPSS rescore
  11. 2026-08-25 07:48 UTCEG score recompute
  12. 2026-08-24 09:36 UTCEG score recompute
  13. 2026-08-23 11:24 UTCEG score recompute
  14. 2026-08-23 00:19 UTCEPSS rescore
  15. 2026-08-22 13:12 UTCEG score recompute
  16. 2026-08-21 23:49 UTCEPSS rescore
  17. 2026-08-21 15:00 UTCEG score recompute
  18. 2026-08-20 22:55 UTCEPSS rescore
  19. 2026-08-19 18:36 UTCEG score recompute
  20. 2026-08-19 17:04 UTCEPSS rescore
  21. 2026-08-18 20:23 UTCEG score recompute
  22. 2026-08-18 19:19 UTCEG score recompute
  23. 2026-08-18 17:21 UTCEG score recompute
  24. 2026-08-18 17:07 UTCEG score recompute
  25. 2026-08-18 17:04 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55106?
CVE-2026-55106 is a medium vulnerability published on August 18, 2026. 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…
When was CVE-2026-55106 disclosed?
CVE-2026-55106 was first published in the National Vulnerability Database on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55106 actively exploited?
CVE-2026-55106 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 83.6% of all scored CVEs.
What is the CVSS score of CVE-2026-55106?
CVE-2026-55106 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-55106?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55106, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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