CVE-2026-9689

A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web address. If a user clicks this link, the client application might incorrectly prioritize attacker-controlled information over legitimate data. This vulnerability, known as HTTP parameter pollution, could allow an attacker to bypass security measures or gain unauthorized access to resources.

CVSS v3 4.2 MEDIUM

4.2^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:50846
https://access.redhat.com/errata/RHSA-2026:50847
https://access.redhat.com/errata/RHSA-2026:50848
https://access.redhat.com/errata/RHSA-2026:50849
https://access.redhat.com/security/cve/CVE-2026-9689	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2481845	Issue Tracking Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:-:*:*:*

History

26 Oct 2026, 11:10

Type	Values Removed	Values Added
Summary		(es) Se encontró una falla en Keycloak, una solución de gestión de identidad y acceso de código abierto. Cuando una aplicación cliente está configurada para aceptar identificadores uniformes de recursos (URI) de redirección amplios, un atacante remoto puede manipular el proceso de autenticación al crear una dirección web especial. Si un usuario hace clic en este enlace, la aplicación cliente podría priorizar incorrectamente la información controlada por el atacante sobre los datos legítimos. Esta vulnerabilidad, conocida como contaminación de parámetros HTTP, podría permitir a un atacante eludir las medidas de seguridad o obtener acceso no autorizado a recursos.

Information

Published : 2026-05-27 12:17

Updated : 2026-10-26 11:10

NVD link : CVE-2026-9689

Mitre link : CVE-2026-9689

CVE.ORG link : CVE-2026-9689

JSON object : View

Products Affected

redhat

build_of_keycloak

CWE

CWE-1288

Improper Validation of Consistency within Input

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