CVE-2023-6544 - CVE House
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Status published Medium CVE-2023-6544

Keycloak: authorization bypass

Vulnerability Description

A flaw was found in the Keycloak package. This issue occurs due to a permissive regular expression hardcoded for filtering which allows hosts to register a dynamic client. A malicious user with enough information about the environment could jeopardize an environment with this specific Dynamic Client Registration and TrustedDomain configuration previously unauthorized.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Red Hat would like to thank Bastian Kanbach (Secure Systems DE [bastian.kanbach@securesystems.de]) for reporting this issue.

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Affected Vendor

Affected Software

Red Hat build of Keycloak 22, Red Hat build of Keycloak 22.0.10, Red Hat Single Sign-On 7.6 for RHEL 7, Red Hat Single Sign-On 7.6 for RHEL 8, Red Hat Single Sign-On 7.6 for RHEL 9, RHEL-8 based Middleware Containers, RHSSO 7.6.8
Vulnerable Versions:
22.0.0, 23.0.0, 22.0.10-1, 22-13, 22-16, 0:18.0.13-1.redhat_00001.1.el7sso, 0:18.0.13-1.redhat_00001.1.el8sso, 0:18.0.13-1.redhat_00001.1.el9sso, 7.6-46

Timeline

Official Publish: April 25th, 2024
Last Modified: November 11th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Weaknesses (CWE)

CWE-625

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.