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CVE-2026-26335

Estado: AnalizadaCrítica (9.3)—

Calero VeraSMART versions prior to 2022 R1 use static ASP.NET/IIS machineKey values configured for the VeraSMART web application and stored in C:\\Program Files (x86)\\Veramark\\VeraSMART\\WebRoot\\web.config. An attacker who obtains these keys can craft a valid ASP.NET ViewState payload that passes integrity validation and is accepted by the application, resulting in server-side deserialization and remote code execution in the context of the IIS application.

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.

Acceso remoto a aplicación web expuesta (AV:N/PR:N/UI:N). La obtención de machineKey estática permite craftar ViewState válido para RCE en contexto IIS (ejecución de código) y acceso a datos del servidor.

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 ManagementVulnerability ScanningRestrict Web-Based ContentNetwork SegmentationLimit Software InstallationLimit Access to Resource Over Network

Tecnologías afectadas (1)

Calero — Verasmart

CWE

Referencias

JSON original (NVD)

Mostrar
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          "options": [
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          "integrityImpact": "HIGH",
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          "confidentialityImpact": "HIGH"
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      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
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        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
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      "url": "https://www.vulncheck.com/advisories/calero-verasmart-2022-r1-static-iis-machine-keys-enable-viewstate-rce",
      "tags": [
        "Third Party Advisory"
      ],
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  "vulnStatus": "Analyzed",
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          "value": "CWE-321"
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  ],
  "descriptions": [
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      "lang": "en",
      "value": "Calero VeraSMART versions prior to 2022 R1 use static ASP.NET/IIS machineKey values configured for the VeraSMART web application and stored in C:\\\\Program Files (x86)\\\\Veramark\\\\VeraSMART\\\\WebRoot\\\\web.config. An attacker who obtains these keys can craft a valid ASP.NET ViewState payload that passes integrity validation and is accepted by the application, resulting in server-side deserialization and remote code execution in the context of the IIS application."
    },
    {
      "lang": "es",
      "value": "Las versiones de Calero VeraSMART anteriores a 2022 R1 utilizan valores estáticos de machineKey de ASP.NET/IIS configurados para la aplicación web VeraSMART y almacenados en C:\\\\Program Files (x86)\\\\Veramark\\\\VeraSMART\\\\WebRoot\\\\web .config. Un atacante que obtiene estas claves puede crear una carga útil de ViewState de ASP.NET válida que pasa la validación de integridad y es aceptada por la aplicación, lo que resulta en deserialización del lado del servidor y ejecución remota de código en el contexto de la aplicación IIS."
    }
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  "lastModified": "2026-06-17T10:26:06.940",
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}