FKIE_CVE-2026-32728

Vulnerability from fkie_nvd - Published: 2026-03-18 22:16 - Updated: 2026-03-19 17:41
Severity ?
7.6 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
Summary
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.15 and 8.6.41, an attacker who is allowed to upload files can bypass the file extension filter by appending a MIME parameter (e.g. `;charset=utf-8`) to the `Content-Type` header. This causes the extension validation to fail matching against the blocklist, allowing active content to be stored and served under the application's domain. In addition, certain XML-based file extensions that can render scripts in web browsers are not included in the default blocklist. This can lead to stored XSS attacks, compromising session tokens, user credentials, or other sensitive data accessible via the browser's local storage. The fix in versions 9.6.0-alpha.15 and 8.6.41 strips MIME parameters from the `Content-Type` header before validating the file extension against the blocklist. The default blocklist has also been extended to include additional XML-based extensions (`xsd`, `rng`, `rdf`, `rdf+xml`, `owl`, `mathml`, `mathml+xml`) that can render active content in web browsers. Note that the `fileUpload.fileExtensions` option is intended to be configured as an allowlist of file extensions that are valid for a specific application, not as a denylist. The default denylist is provided only as a basic default that covers most common problematic extensions. It is not intended to be an exhaustive list of all potentially dangerous extensions. Developers should not rely on the default value, as new extensions that can render active content in browsers might emerge in the future. As a workaround, configure the `fileUpload.fileExtensions` option to use an allowlist of only the file extensions that your application needs, rather than relying on the default blocklist.
References
security-advisories@github.comhttps://github.com/parse-community/parse-server/commit/4f53ab3cad5502a51a509d53f999e00ff7217b8dPatch
security-advisories@github.comhttps://github.com/parse-community/parse-server/commit/c7599c577a02b97eb5e76d4e20517b0283ae73c8Patch
security-advisories@github.comhttps://github.com/parse-community/parse-server/pull/10191Issue Tracking
security-advisories@github.comhttps://github.com/parse-community/parse-server/pull/10192Issue Tracking
security-advisories@github.comhttps://github.com/parse-community/parse-server/security/advisories/GHSA-42ph-pf9q-cr72Vendor Advisory
Impacted products
Vendor Product Version
parseplatform parse-server *
parseplatform parse-server *
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
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{
  "configurations": [
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.15 and 8.6.41, an attacker who is allowed to upload files can bypass the file extension filter by appending a MIME parameter (e.g. `;charset=utf-8`) to the `Content-Type` header. This causes the extension validation to fail matching against the blocklist, allowing active content to be stored and served under the application\u0027s domain. In addition, certain XML-based file extensions that can render scripts in web browsers are not included in the default blocklist. This can lead to stored XSS attacks, compromising session tokens, user credentials, or other sensitive data accessible via the browser\u0027s local storage. The fix in versions 9.6.0-alpha.15 and 8.6.41 strips MIME parameters from the `Content-Type` header before validating the file extension against the blocklist. The default blocklist has also been extended to include additional XML-based extensions (`xsd`, `rng`, `rdf`, `rdf+xml`, `owl`, `mathml`, `mathml+xml`) that can render active content in web browsers. Note that the `fileUpload.fileExtensions` option is intended to be configured as an allowlist of file extensions that are valid for a specific application, not as a denylist. The default denylist is provided only as a basic default that covers most common problematic extensions. It is not intended to be an exhaustive list of all potentially dangerous extensions. Developers should not rely on the default value, as new extensions that can render active content in browsers might emerge in the future. As a workaround, configure the `fileUpload.fileExtensions` option to use an allowlist of only the file extensions that your application needs, rather than relying on the default blocklist."
    },
    {
      "lang": "es",
      "value": "Parse Server es un backend de c\u00f3digo abierto que puede ser desplegado en cualquier infraestructura que pueda ejecutar Node.js. Antes de 9.6.0-alpha.15 y 8.6.41, un atacante al que se le permite subir archivos puede eludir el filtro de extensi\u00f3n de archivo a\u00f1adiendo un par\u00e1metro MIME (p. ej., `;charset=utf-8`) al encabezado `Content-Type`. Esto hace que la validaci\u00f3n de la extensi\u00f3n falle al cotejarla con la lista de bloqueo, permitiendo que el contenido activo sea almacenado y servido bajo el dominio de la aplicaci\u00f3n. Adem\u00e1s, ciertas extensiones de archivo basadas en XML que pueden renderizar scripts en navegadores web no est\u00e1n incluidas en la lista de bloqueo predeterminada. Esto puede llevar a ataques de XSS almacenado, comprometiendo tokens de sesi\u00f3n, credenciales de usuario u otros datos sensibles accesibles a trav\u00e9s del almacenamiento local del navegador. La correcci\u00f3n en las versiones 9.6.0-alpha.15 y 8.6.41 elimina los par\u00e1metros MIME del encabezado `Content-Type` antes de validar la extensi\u00f3n de archivo contra la lista de bloqueo. La lista de bloqueo predeterminada tambi\u00e9n se ha extendido para incluir extensiones adicionales basadas en XML (`xsd`, `rng`, `rdf`, `rdf+xml`, `owl`, `mathml`, `mathml+xml`) que pueden renderizar contenido activo en navegadores web. Tenga en cuenta que la opci\u00f3n `fileUpload.fileExtensions` est\u00e1 destinada a ser configurada como una lista de permitidos de extensiones de archivo que son v\u00e1lidas para una aplicaci\u00f3n espec\u00edfica, no como una lista de denegados. La lista de denegados predeterminada se proporciona solo como un valor predeterminado b\u00e1sico que cubre las extensiones problem\u00e1ticas m\u00e1s comunes. No pretende ser una lista exhaustiva de todas las extensiones potencialmente peligrosas. Los desarrolladores no deben depender del valor predeterminado, ya que nuevas extensiones que pueden renderizar contenido activo en navegadores podr\u00edan surgir en el futuro. Como soluci\u00f3n alternativa, configure la opci\u00f3n `fileUpload.fileExtensions` para usar una lista de permitidos de solo las extensiones de archivo que su aplicaci\u00f3n necesita, en lugar de depender de la lista de bloqueo predeterminada."
    }
  ],
  "id": "CVE-2026-32728",
  "lastModified": "2026-03-19T17:41:27.567",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.6,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.3,
        "impactScore": 4.7,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.3,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "LOW",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:H/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-03-18T22:16:24.983",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/parse-community/parse-server/commit/4f53ab3cad5502a51a509d53f999e00ff7217b8d"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
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    {
      "source": "security-advisories@github.com",
      "tags": [
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      "url": "https://github.com/parse-community/parse-server/pull/10191"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
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      ],
      "url": "https://github.com/parse-community/parse-server/pull/10192"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-42ph-pf9q-cr72"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.