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CVE-2026-106503

Estado: RecibidaAlta (8.1)—

Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by scaffolder action input authorization bypass. An authenticated user with access to affected Scaffolder templates could bypass configured action restrictions. Depending on integration credentials, this could grant unauthorized access to repositories and related source-control resources. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.

CVSS

Probabilidad de explotación (EPSS)

FIRST aún no ha puntuado esta CVE (habitual en CVEs muy recientes o rechazadas).

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:N/PR:L requiere privilegios en red remota (T1210). Usuario autenticado bypasea restricciones y accede a credenciales de integración para repositorios (T1078.001, T1552.007).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementNetwork SegmentationVulnerability ScanningUser Account ManagementThreat Intelligence ProgramPassword Policies

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Backstage — Plugin Scaffolder BackendAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-106503",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.1,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "backstage",
          "product": "backstage",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.49.6"
            },
            {
              "status": "affected",
              "version": ">= 1.50.0-next.0, < 1.50.5"
            },
            {
              "status": "affected",
              "version": ">= 1.51.0-next.0, < 1.54.6"
            }
          ]
        },
        {
          "vendor": "@backstage",
          "product": "plugin-scaffolder-backend",
          "versions": [
            {
              "status": "affected",
              "version": "< 3.3.1"
            },
            {
              "status": "affected",
              "version": ">= 3.4.0, < 3.4.1"
            },
            {
              "status": "affected",
              "version": ">= 4.0.0, < 4.0.3"
            },
            {
              "status": "affected",
              "version": ">= 4.0.4, < 4.1.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-10-06T22:17:05.513",
  "references": [
    {
      "url": "https://github.com/backstage/backstage/commit/11c1384c0649b8ab26391c6a4e4f34b80ab0d188",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/backstage/backstage/commit/a91ed72d540e80b62a73b39bb1563ff5018d52d1",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/backstage/backstage/commit/e307e4f487103d815e484291b3fda778ab9983bf",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/backstage/backstage/releases/tag/v1.49.6",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/backstage/backstage/releases/tag/v1.50.5",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/backstage/backstage/security/advisories/GHSA-hmp2-4m7g-22cv",
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-178"
        },
        {
          "lang": "en",
          "value": "CWE-284"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by scaffolder action input authorization bypass. An authenticated user with access to affected Scaffolder templates could bypass configured action restrictions. Depending on integration credentials, this could grant unauthorized access to repositories and related source-control resources. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0."
    }
  ],
  "lastModified": "2026-10-06T22:17:05.513",
  "sourceIdentifier": "security-advisories@github.com"
}