CVE-2026-16071Network attack vectorHinoki check available

Account disclosure via unchecked LDAP entry DN

Published Aug 5, 2026 · Updated Aug 5, 2026

LDAP boundary bypass in Red Hat build of Keycloak 26.4 and 26.6 allows remote authenticated users to disclose unauthorized accounts. The LDAP storage provider accepts a specific entry DN without checking that it remains beneath the configured users DN, then performs the lookup and import outside that boundary. Exploitation requires delegated administrative privileges and an LDAP federation; it exposes account details from unauthorized OUs and imports those users into local storage.

CVSS severity5.4
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

LDAP boundary bypass in Red Hat build of Keycloak 26.4 and 26.6 allows remote authenticated users to disclose unauthorized accounts. The LDAP storage provider accepts a specific entry DN without checking that it remains beneath the configured users DN, then performs the lookup and import outside that boundary. Exploitation requires delegated administrative privileges and an LDAP federation; it exposes account details from unauthorized OUs and imports those users into local storage.

The record

CVE
CVE-2026-16071
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
389 Directory Server
Product
Red Hat build of Keycloak
Classifications
CWE-269, T1087.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

389 Directory Server · Red Hat build of KeycloakAffected versions are unavailable in this record.

Published CVSS scores

5.4Red HatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
T1087.002Account Discovery: Domain Account

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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