CVE-2026-9705: Keycloak: keycloak: attacker can re-enable and take over disabled clients via registration access token

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-25 · updated 2026-07-01
Weakness: CWE-613

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.

Affected products

Red Hat build of Keycloak 26.4: from 26.4 before 26.4.13; from 26.6 before 26.6.4 — fixed in 26.4.13, 26.6.4

How to fix

Upgrade to a fixed version: Red Hat build of Keycloak 26.4 26.4.13, 26.6.4. Check the vendor advisory for mitigations.

References

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