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CVE-2026-13323

Estado: AnalizadaAlta (8.7)—

In Open VSX Registry before 1.0.2, the /vscode/unpkg/ endpoint serves user-supplied HTML files with Content-Type: text/html and without a Content-Security-Policy or Content-Disposition: attachment response header. An unauthenticated attacker can register a publisher account, upload a VSIX containing a crafted HTML payload, and induce an authenticated user to visit the resulting URL.

Leer descripción completaMostrar menos

The browser renders the file inline in the open-vsx.org origin context, enabling session token exfiltration, persistent Personal Access Token (PAT) generation, and unauthorized publication of malicious extension versions. Because Open VSX extensions are distributed to VS Code, VSCodium, Cursor, Windsurf, and compatible editors, a compromised extension update constitutes a supply chain attack against all downstream users.

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).

🎯 Técnicas ATT&CK

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

XSS vía HTML renderizado en contexto de origen (CWE-79, sin CSP), permite robo de tokens de sesión y credenciales, así como inyección de código malicioso en extensiones descargadas por millones de usuarios.

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

Restrict Web-Based ContentDisable or Remove Feature or ProgramUser TrainingUser Account ManagementPrivileged Account ManagementNetwork Segmentation

Tecnologías afectadas (1)

Eclipse — Open VSX

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-13323",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-13323",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-07-01T12:13:20.675139Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
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        "cvssData": {
          "scope": "CHANGED",
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
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          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 2.3
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
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          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
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          "confidentialityImpact": "HIGH"
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      }
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  },
  "affected": [
    {
      "source": "emo@eclipse.org",
      "affectedData": [
        {
          "vendor": "Eclipse Foundation",
          "product": "Eclipse Open VSX",
          "versions": [
            {
              "status": "affected",
              "version": "0.1.0",
              "lessThan": "1.0.2",
              "versionType": "semver"
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          ],
          "defaultStatus": "unaffected"
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  ],
  "published": "2026-07-01T12:16:38.117",
  "references": [
    {
      "url": "https://github.com/eclipse-openvsx/openvsx/pull/1922",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "source": "emo@eclipse.org"
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    {
      "url": "https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485",
      "tags": [
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        "Issue Tracking",
        "Vendor Advisory"
      ],
      "source": "emo@eclipse.org"
    },
    {
      "url": "https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485",
      "tags": [
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        "Issue Tracking",
        "Vendor Advisory"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "emo@eclipse.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In Open VSX Registry before 1.0.2, the /vscode/unpkg/ endpoint serves user-supplied HTML files with Content-Type: text/html and without a Content-Security-Policy or Content-Disposition: attachment response header. An unauthenticated attacker can register a publisher account, upload a VSIX containing a crafted HTML payload, and induce an authenticated user to visit the resulting URL. The browser renders the file inline in the open-vsx.org origin context, enabling session token exfiltration, persistent Personal Access Token (PAT) generation, and unauthorized publication of malicious extension versions. Because Open VSX extensions are distributed to VS Code, VSCodium, Cursor, Windsurf, and compatible editors, a compromised extension update constitutes a supply chain attack against all downstream users."
    }
  ],
  "lastModified": "2026-07-06T20:33:10.970",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:eclipse:open_vsx:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B5F7F9F8-48A6-4604-8CA4-65FCF39BA2FD",
              "versionEndExcluding": "1.0.2"
            }
          ],
          "operator": "OR"
        }
      ]
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  ],
  "sourceIdentifier": "emo@eclipse.org"
}