CVE-2026-18207Network attack vector

Client policy bypass via duplicate group names

Published Jul 29, 2026 · Updated Jul 29, 2026

Improper authorization in Red Hat build of Keycloak allows remote authenticated users to bypass client policy enforcement. The source-group condition validates group membership by non-unique group name rather than unique identifier across the hierarchy. Client management privileges and a duplicate-name group hierarchy permit registration or updates without required hardening profiles.

CVSS severity6.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Red Hat build of Keycloak allows remote authenticated users to bypass client policy enforcement. The source-group condition validates group membership by non-unique group name rather than unique identifier across the hierarchy. Client management privileges and a duplicate-name group hierarchy permit registration or updates without required hardening profiles.

The record

CVE
CVE-2026-18207
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
389 Directory Server
Product
Red Hat build of Keycloak
Classifications
CWE-285
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 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

6.5Red HatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-285Improper Authorization

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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