Vulnerabilidad · Publicado 01/08/2026
El plugin @better-auth/scim para better-auth en versiones 1.4.0-beta.27 a 1.6.21 y 1.7.0-beta.0 a 1.7.0-beta.9 contiene una falla de autorización que permite a atacantes reutilizar identificadores de proveedores SSO/SAML/OIDC existentes en la emisión de tokens SCIM, comprometiendo la identidad de usuarios y cuentas corporativas. Afecta principalmente sistemas de gestión de identidades y acceso (IAM) en empresas que implementan provisionamiento automático de usuarios.
@better-auth/scim (a better-auth plugin) versions >= 1.4.0-beta.27 through <= 1.6.21 and >= 1.7.0-beta.0 through <= 1.7.0-beta.9 contain an authorization bypass. SCIM token issuance did not reject provider IDs already used by existing SSO, SAML, OIDC, generic OAuth, or social account providers, and the same logical provider ID was used for both SCIM provider configuration and account ownership. An authenticated user could mint a SCIM token whose provider ID collided with an existing provider namespace, causing SCIM user routes to resolve account rows the token never provisioned. This allowed listing, reading, updating (including rewriting global profile/email fields without uniqueness checks), and deleting global user accounts and sessions, resulting in account takeover and unauthorized deprovisioning. Fixed in 1.6.22 and 1.7.0-beta.10 (1.7.0-rc.0).
Score: 9.9/10 — Severidad: CRITICAL — Estado NIST: Received
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE-20
Publicado en NIST NVD.