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CVE-2026-32236

Estado: ModificadaBaja (1.7)—

Backstage is an open framework for building developer portals. Prior to 0.27.1, a Server-Side Request Forgery (SSRF) vulnerability exists in @backstage/plugin-auth-backend when auth.experimentalClientIdMetadataDocuments.enabled is set to true. The CIMD metadata fetch validates the initial client_id hostname against private IP ranges but does not apply the same validation after HTTP redirects. The practical impact is limited.

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The attacker cannot read the response body from the internal request, cannot control request headers or method, and the feature must be explicitly enabled via an experimental flag that is off by default. Deployments that restrict allowedClientIdPatterns to specific trusted domains are not affected. Patched in @backstage/plugin-auth-backend version 0.27.1.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linuxfoundation — Backstage

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-32236",
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      "lang": "en",
      "value": "Backstage is an open framework for building developer portals. Prior to 0.27.1, a Server-Side Request Forgery (SSRF) vulnerability exists in @backstage/plugin-auth-backend when auth.experimentalClientIdMetadataDocuments.enabled is set to true. The CIMD\nmetadata fetch validates the initial client_id hostname against private IP ranges but does not apply the same validation after HTTP redirects. The practical impact is limited. The attacker cannot read the response body from the internal request, cannot control request headers or method, and the feature must be explicitly enabled via an experimental flag that is off by default. Deployments that restrict allowedClientIdPatterns to specific trusted domains are not affected. Patched in @backstage/plugin-auth-backend version 0.27.1."
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      "value": "Backstage es un framework abierto para construir portales de desarrollador. Antes de 0.27.1, existe una vulnerabilidad de falsificación de petición del lado del servidor (SSRF) en @backstage/plugin-auth-backend cuando auth.experimentalClientIdMetadataDocuments.enabled está configurado como true. La obtención de metadatos CIMD valida el nombre de host client_id inicial contra rangos de IP privados, pero no aplica la misma validación después de las redirecciones HTTP. El impacto práctico es limitado. El atacante no puede leer el cuerpo de la respuesta de la petición interna, no puede controlar las cabeceras o el método de la petición, y la característica debe habilitarse explícitamente mediante una bandera experimental que está desactivada por defecto. Las implementaciones que restringen allowedClientIdPatterns a dominios de confianza específicos no se ven afectadas. Parcheado en la versión 0.27.1 de @backstage/plugin-auth-backend."
    }
  ],
  "lastModified": "2026-06-17T10:35:24.013",
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