Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-06-25T15:59:03 keycloak: Keycloak: Attacker can re-enable and take over disabled clients via Registration Access Token 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N CWE-613

A flaw was found in Keycloak's client registration service. A remote attacker, possessing a previously issued Registration Access Token (RAT), could exploit this vulnerability to re-enable a client that an administrator had explicitly disabled. This bypasses security controls, allowing the attacker to reset the client's secret and potentially regain privileged API access. The primary impact includes unauthorized information disclosure and potential integrity compromise.

A flaw was found in Keycloak's client registration service. A remote attacker, possessing a previously issued Registration Access Token (RAT), could exploit this vulnerability to re-enable a client that an administrator had explicitly disabled. This bypasses security controls, allowing the attacker to reset the client's secret and potentially regain privileged API access. The primary impact includes unauthorized information disclosure and potential integrity compromise.

A Moderate flaw was found in Keycloak where a disabled client can be re-enabled by an attacker who retains a Registration Access Token (RAT) from a prior legitimate client registration. This allows the attacker to bypass the administrator's explicit intent to disable the client, reset its secret, and restore OAuth client_credentials capability, potentially leading to unauthorized access to resources. Red Hat would like to thank Qiulin Deng for reporting this issue. To mitigate this issue, restrict network access to the Keycloak Dynamic Client Registration endpoint. Configure network firewalls to allow connections only from trusted hosts or networks that legitimately require access to this functionality. This limits the exposure of the vulnerable endpoint to unauthorized access attempts. Red Hat build of Keycloak 26.4 2026-06-25T00:00:00Z RHSA-2026:30050 rhbk/keycloak-operator-bundle:26.4.13-1 Red Hat build of Keycloak 26.4 2026-06-25T00:00:00Z RHSA-2026:30050 rhbk/keycloak-rhel9:26.4-19 Red Hat build of Keycloak 26.4 2026-06-25T00:00:00Z RHSA-2026:30050 rhbk/keycloak-rhel9-operator:26.4-19 Red Hat build of Keycloak 26.4.13 2026-06-25T00:00:00Z RHSA-2026:30049 rhbk/keycloak-rhel9 Red Hat build of Keycloak 26.6 2026-06-25T00:00:00Z RHSA-2026:30084 rhbk/keycloak-operator-bundle:26.6.4-2 Red Hat build of Keycloak 26.6 2026-06-25T00:00:00Z RHSA-2026:30084 rhbk/keycloak-rhel9:26.6-8 Red Hat build of Keycloak 26.6 2026-06-25T00:00:00Z RHSA-2026:30084 rhbk/keycloak-rhel9-operator:26.6-8 Red Hat build of Keycloak 26.6.4 2026-06-25T00:00:00Z RHSA-2026:30083 rhbk/keycloak-rhel9 https://www.cve.org/CVERecord?id=CVE-2026-9705 https://nvd.nist.gov/vuln/detail/CVE-2026-9705