Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

CVE-2026-87031

Gravedad CVSS v4.0:
BAJA
Tipo:
No Disponible / Otro tipo
Fecha de publicación:
16/09/2026
Última modificación:
21/09/2026

Descripción

*** Pendiente de traducción *** n Concrete CMS 9.2.0 through 9.5.3, the REST API user creation endpoint (POST /ccm/api/1.0/users, the add() method of concrete/src/Api/Controller/Users.php) did not perform a permission check before creating an account. As a result, any valid OAuth token carrying the users:add scope, including a client_credentials token with no associated user context, could create active, validated user accounts, bypassing email verification and administrator approval. Under default registration settings the created accounts could then edit page content, providing a path to stored cross-site scripting and further compromise. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.1 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.

Productos y versiones vulnerables

CPE Desde Hasta
cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:* 9.2.0 (incluyendo) 9.5.3 (excluyendo)