CVE-2026-9803
Medium · 5.3CVSS
5.3
EPSS
0.7%
Published
May 28, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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