---
id: "CVE-2026-9705"
kind: "vulnerability"
aliases: ["CVE-2026-9705", "GHSA-r7rc-c989-86g6"]
title: "Keycloak: Attacker can re-enable and take over disabled clients via registration access token"
severity: "medium"
cvss: 6.5
epss: 0.00464
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "org.keycloak:keycloak-services", "fixed": ["26.6.4"], "affected": "< 26.6.4", "ecosystem": "maven"}, {"name": "redhat build of keycloak", "fixed": ["26.4.13"], "affected": ">= 26.4, < 26.4.13", "ecosystem": "vendor"}, {"name": "redhat build of keycloak", "fixed": ["26.6.4"], "affected": ">= 26.6, < 26.6.4", "ecosystem": "vendor"}]
ecosystems: ["maven", "vendor"]
tags: ["cwe-613", "identity", "infrastructure", "keycloak", "oauth", "self-hosted"]
not_affected_if: ["fixed-version", "no-client-registration"]
published_at: "2026-06-25T17:17:03+00:00"
first_seen_at: "2026-10-29T16:39:02+00:00"
updated_at: "2026-10-29T16:56:32+00:00"
sources: [{"source": "ghsa", "url": "https://github.com/advisories/GHSA-r7rc-c989-86g6", "first_seen_at": "2026-10-29T16:39:02+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9705", "first_seen_at": "2026-10-29T16:56:32+00:00"}]
---

# Keycloak: Attacker can re-enable and take over disabled clients via registration access token

Keycloak's client registration service lets someone holding a previously issued Registration Access Token re-enable a client that an administrator disabled. The attacker can then reset that client's secret and may regain privileged API access.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- maven:org.keycloak:keycloak-services affected < 26.6.4 fixed 26.6.4
- vendor:redhat build of keycloak affected >= 26.4, < 26.4.13 fixed 26.4.13
- vendor:redhat build of keycloak affected >= 26.6, < 26.6.4 fixed 26.6.4

## How to check

- Check the Keycloak version with the server's startup log or admin console; the affected range is `keycloak-services` below `26.6.4`.
- Look for clients that were disabled on purpose and confirm they are still disabled.
- Review whether Registration Access Tokens are issued and where they are stored.

## Fix

- Keycloak `keycloak-services` `26.6.4`

## Timeline

- 2026-10-29T16:39:02+00:00 ghsa https://github.com/advisories/GHSA-r7rc-c989-86g6
- 2026-10-29T16:56:32+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-9705

## Documents

- [advisory] Maintainer's advisory: api.github.com https://api.github.com/repos/keycloak/keycloak/security-advisories/GHSA-r7rc-c989-86g6
- [advisory] Maintainer's advisory: github.com https://github.com/keycloak/keycloak/security/advisories/GHSA-r7rc-c989-86g6
- [advisory] Third-party advisory: access.redhat.com https://access.redhat.com/errata/RHSA-2026:30049
- [advisory] Third-party advisory: access.redhat.com https://access.redhat.com/errata/RHSA-2026:30050
- [advisory] Third-party advisory: access.redhat.com https://access.redhat.com/errata/RHSA-2026:30083
- [advisory] Third-party advisory: access.redhat.com https://access.redhat.com/errata/RHSA-2026:30084
- [advisory] Vendor advisory: access.redhat.com https://access.redhat.com/security/cve/CVE-2026-9705
- [advisory] Vendor advisory: bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2481878

## From the sources

### 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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_