En resumen
- CVE-2026-9803 es una vulnerabilidad MEDIO (CVSS 5.3) que afecta a org.keycloak:keycloak-services.
- Probabilidad de explotación en los próximos 30 días (EPSS): 0.42%, mayor que el 36.1% de las vulnerabilidades.
- Solución: actualizar a 26.6.3 o posterior.
Description
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.
NVD description
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.
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