CVE-2026-55778

{
  "id": "CVE-2026-55778",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-08T21:16:50.387",
  "lastModified": "2026-10-25T17:10:00.197",
  "vulnStatus": "Deferred",
  "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 9.9.1-alpha.11 and 8.6.81, the default fileUpload.fileExtensions blocklist could be bypassed by uploading a file with a non-standard or compound extension and dangerous content type, allowing storage adapters such as S3 and GCS to serve attacker-supplied active content and enable stored cross-site scripting. This issue is fixed in versions 9.9.1-alpha.11 and 8.6.81."
    },
    {
      "lang": "es",
      "value": "Parse Server es un backend de código abierto que puede ser desplegado en cualquier infraestructura que pueda ejecutar Node.js. Antes de las versiones 9.9.1-alpha.11 y 8.6.81, la lista de bloqueo predeterminada fileUpload.fileExtensions podía ser eludida al subir un archivo con una extensión no estándar o compuesta y un tipo de contenido peligroso, permitiendo que adaptadores de almacenamiento como S3 y GCS sirvieran contenido activo suministrado por el atacante y habilitaran cross-site scripting almacenado. Este problema está solucionado en las versiones 9.9.1-alpha.11 y 8.6.81."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "parse-community",
          "product": "parse-server",
          "versions": [
            {
              "version": ">= 9.0.0-alpha.1, < 9.9.1-alpha.11",
              "status": "affected"
            },
            {
              "version": "< 8.6.81",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/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",
          "baseScore": 2.1,
          "baseSeverity": "LOW",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "LOW",
          "userInteraction": "PASSIVE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "LOW",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-09T13:39:32.908358Z",
          "id": "CVE-2026-55778",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-434"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/parse-community/parse-server/pull/10505",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/parse-community/parse-server/pull/10506",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/parse-community/parse-server/releases/tag/8.6.81",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93",
      "source": "[email protected]"
    }
  ]
}