CVE-2026-2733: Org.keycloak/keycloak-services: keycloak: missing check on disabled client for docker registry protocol

Severity: low (CVSS 3.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-19 · updated 2026-06-17
Weakness: CWE-285

Description

A flaw was identified in the Docker v2 authentication endpoint of Keycloak, where tokens continue to be issued even after a Docker registry client has been administratively disabled. This means that turning the client “Enabled” setting to OFF does not fully prevent access. As a result, previously valid credentials can still be used to obtain authentication tokens. This weakens administrative controls and could allow unintended access to container registry resources.

Affected products

Red Hat build of Keycloak 26.4: all versions — fixed in 26.4-12, 26.4.10-1
Red Hat JBoss Enterprise Application Platform 8: all versions
Red Hat JBoss Enterprise Application Platform Expansion Pack: all versions
Red Hat Single Sign-On 7: all versions

How to fix

Upgrade to a fixed version: Red Hat build of Keycloak 26.4 26.4-12, 26.4.10-1. Check the vendor advisory for mitigations.

References

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