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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-9705)

The version of Keycloak installed on the remote host is prior to 26.6.4. It is, therefore, affected by multiple vulnerabilities, including the following:

  - A user with group-admin privileges can escalate to realm-admin, gaining full administrative control     over the realm. (CVE-2026-9099)

  - An authentication bypass exists via JWT algorithm confusion, allowing unauthorized access.
    (CVE-2026-11800)

  - Any authenticated user can bypass all authorization policies, including role, scope, and UMA     permission checks, by including the configured access-denied page path within a request URL, gaining     unauthorized access to protected resources. (CVE-2026-9800)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
477907	SCA: security update for org.keycloak:keycloak-services (GHSA-r7rc-c989-86g6)	Tenable Cloud Security	SCA Checks	Local	medium
477907	SCA: security update for org.keycloak:keycloak-services (GHSA-r7rc-c989-86g6)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium
324966	Keycloak < 26.6.4 Multiple Vulnerabilities	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-9705

medium

Tenable Plugins

medium

medium

high