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CVE-2025-27801

Estado: AplazadaMedia (4.6)—

The Episerver Content Management System (CMS) by Optimizely was affected by multiple Stored Cross-Site Scripting (XSS) vulnerabilities. This allowed an authenticated attacker to execute malicious JavaScript code in the victim's browser.

ContentReference properties, which could be used in the "Edit" section of the CMS, offered an upload functionality for documents. These documents could later be used as displayed content on the page. It was possible to upload SVG files that include malicious JavaScript code that would be executed if a user visited the direct URL of the preview image. Attackers needed at least the role "WebEditor" in order to exploit this issue.

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Affected products: Version 11.X: EPiServer.CMS.Core (<11.21.4) with EPiServer.CMS.UI (<11.37.5), Version 12.X: EPiServer.CMS.Core (<12.22.1) with EPiServer.CMS.UI (<11.37.3)

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 (2)

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

Optimizely — Episerver CMS CoreAIOptimizely — Episerver CMS UIAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-27801",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-27801",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-07-28T16:48:16.253770Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "551230f0-3615-47bd-b7cc-93e92e730bbf",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 4.8,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 1.7
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "551230f0-3615-47bd-b7cc-93e92e730bbf",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 4.6,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:L/VA:L/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "ACTIVE",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "HIGH",
          "subIntegrityImpact": "LOW",
          "vulnIntegrityImpact": "LOW",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "LOW",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "LOW",
          "vulnConfidentialityImpact": "NONE",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "551230f0-3615-47bd-b7cc-93e92e730bbf",
      "affectedData": [
        {
          "vendor": "Optimizely",
          "modules": [
            "EPiServer.CMS.Core"
          ],
          "product": "Episerver Content Management System (CMS)",
          "versions": [
            {
              "status": "affected",
              "version": "11.x",
              "lessThan": "11.21.4",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "12.x",
              "lessThan": "12.22.1",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2025-07-28T09:15:34.590",
  "references": [
    {
      "url": "https://api.nuget.optimizely.com/packages/episerver.cms.core/11.21.4#",
      "source": "551230f0-3615-47bd-b7cc-93e92e730bbf"
    },
    {
      "url": "https://api.nuget.optimizely.com/packages/episerver.cms.core/12.22.1#",
      "source": "551230f0-3615-47bd-b7cc-93e92e730bbf"
    },
    {
      "url": "https://r.sec-consult.com/optimizely",
      "source": "551230f0-3615-47bd-b7cc-93e92e730bbf"
    },
    {
      "url": "http://seclists.org/fulldisclosure/2025/Aug/18",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "551230f0-3615-47bd-b7cc-93e92e730bbf",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Episerver Content Management System (CMS) by Optimizely was affected by multiple Stored Cross-Site Scripting (XSS) vulnerabilities. This allowed an authenticated attacker to execute malicious JavaScript code in the victim's browser.\n\n\n\nContentReference properties, which could be used in the \"Edit\" section of the CMS, offered an upload functionality for documents. These documents could later be used as displayed content on the page. It was possible to upload SVG files that include malicious JavaScript code that would be executed if a user visited the direct URL of the preview image. Attackers needed at least the role \"WebEditor\" in order to exploit this issue.\n\n\n\n\n\n\n\nAffected products: Version 11.X: EPiServer.CMS.Core (<11.21.4) with EPiServer.CMS.UI (<11.37.5), Version 12.X: EPiServer.CMS.Core (<12.22.1) with EPiServer.CMS.UI (<11.37.3)"
    },
    {
      "lang": "es",
      "value": "Episerver Content Management System (CMS) by Optimizely se vio afectado por múltiples vulnerabilidades de Cross-Site Scripting (XSS) almacenado. Esto permitió que un atacante autenticado ejecutara código JavaScript malicioso en el navegador de la víctima. Las propiedades ContentReference, disponibles en la sección \"Edit\" del CMS, ofrecían la función de carga de documentos. Estos documentos podían utilizarse posteriormente como contenido mostrado en la página. Era posible cargar archivos SVG con código JavaScript malicioso que se ejecutaba si un usuario visitaba la URL directa de la imagen de vista previa. Los atacantes necesitaban al menos el rol \"WebEditor\" para explotar este problema. Productos afectados: Versión 11.X: EPiServer.CMS.Core (&lt;11.21.4) con EPiServer.CMS.UI (&lt;11.37.5), Versión 12.X: EPiServer.CMS.Core (&lt;12.22.1) con EPiServer.CMS.UI (&lt;11.37.3)"
    }
  ],
  "lastModified": "2026-06-17T09:04:14.750",
  "sourceIdentifier": "551230f0-3615-47bd-b7cc-93e92e730bbf"
}