Vulnerability/
REDHAT-BUG-2482465

REDHAT-BUG-2482465

Published May 28, 2026

Updated

A flaw was found in Keycloak's ClientRegistrationAuth component. A remote unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with a malformed 'Authorization: Bearer' header to any client registration endpoint. This can lead to an ArrayIndexOutOfBoundsException, causing the server to return an HTTP 500 error and resulting in a Denial of Service (DoS) for the affected service.

Affected Software

1 affected component

Keycloak Keycloak

Event History

May 28, 2026

Data Sourced

via Red Hat·04:08 AM

DescriptionSeverityAffected Software

Frequently Asked Questions

What is the severity of REDHAT-BUG-2482465?

The severity of REDHAT-BUG-2482465 is rated as medium with a score of 4.

How can I fix REDHAT-BUG-2482465?

To fix REDHAT-BUG-2482465, update Keycloak to the latest version where this vulnerability has been addressed.

What impact does REDHAT-BUG-2482465 have on Keycloak?

REDHAT-BUG-2482465 allows a remote unauthenticated attacker to exploit Keycloak by sending specially crafted POST requests, potentially causing an ArrayIndexOutOfBounds exception.

Who is affected by REDHAT-BUG-2482465?

Any installation of Keycloak that exposes client registration endpoints is potentially vulnerable to REDHAT-BUG-2482465.

When was REDHAT-BUG-2482465 published?

REDHAT-BUG-2482465 was published on May 28, 2026.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

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