CVE-2026-9705

Analyzed Analyzed - Analysis Complete

Keycloak Client Registration Privilege Escalation

Publication date: 2026-06-25

Last updated on: 2026-07-01

Assigner: Red Hat, Inc.

Description

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.

CVSS Scores

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Meta Information

Published

2026-06-25

Last Modified

2026-07-01

Generated

2026-07-16

AI Q&A

2026-06-26

EPSS Evaluated

2026-07-14

NVD

CVE-2026-9705

EUVD

EUVD-2026-39474

Affected Vendors & Products

Vendor	Product	Version / Range
redhat	build_of_keycloak	From 26.6 (inc) to 26.6.4 (exc)
redhat	build_of_keycloak	From 26.4 (inc) to 26.4.13 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-613	According to WASC, "Insufficient Session Expiration is when a web site permits an attacker to reuse old session credentials or session IDs for authorization."

Attack-Flow Graph

Compliance Impact

This vulnerability allows an attacker to bypass security controls by re-enabling disabled clients and resetting their secrets, potentially leading to unauthorized access to sensitive information and privileged API access.

Such unauthorized access and potential information disclosure could negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require strict controls over access to personal and sensitive data.

By compromising the integrity and confidentiality of client configurations, this flaw may lead to violations of data protection requirements mandated by these regulations.

Impact Analysis

The vulnerability can lead to unauthorized information disclosure and potential compromise of data integrity.

An attacker could regain privileged API access by resetting client secrets, which may allow further unauthorized actions within the system.

Executive Summary

This vulnerability exists in Keycloak's client registration service. A remote attacker who has a previously issued Registration Access Token (RAT) can exploit the flaw to re-enable a client that an administrator had explicitly disabled.

By doing so, the attacker bypasses security controls, allowing them to reset the client's secret and potentially regain privileged API access.

Mitigation Strategies

To mitigate this vulnerability, you should apply the security updates provided by Red Hat for Keycloak 26.6.4 and the Keycloak Operator for OpenShift as detailed in the advisories RHSA-2026:30083 and RHSA-2026:30084.

These updates address the flaw in the Registration Access Token mechanism that allows attackers to re-enable disabled clients and potentially escalate privileges.

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