Vulnerability-Lookup

Vulnerability from bitnami_vulndb

Published

2026-07-14 15:50

Modified

2026-07-14 16:10

Summary

Parse Server: Stored XSS via non-standard file extension bypassing file upload extension blocklist

Details

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.9.1 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 and 8.6.81.

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "parse",
        "purl": "pkg:bitnami/parse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.6.81"
            },
            {
              "introduced": "9.0.0"
            },
            {
              "fixed": "9.9.1"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "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",
          "type": "CVSS_V4"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55778"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*"
    ],
    "severity": "Low"
  },
  "details": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.9.1 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 and 8.6.81.",
  "id": "BIT-parse-2026-55778",
  "modified": "2026-07-14T16:10:26.025Z",
  "published": "2026-07-14T15:50:19.043Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a"
    },
    {
      "type": "WEB",
      "url": "https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50"
    },
    {
      "type": "WEB",
      "url": "https://github.com/parse-community/parse-server/pull/10505"
    },
    {
      "type": "WEB",
      "url": "https://github.com/parse-community/parse-server/pull/10506"
    },
    {
      "type": "WEB",
      "url": "https://github.com/parse-community/parse-server/releases/tag/8.6.81"
    },
    {
      "type": "WEB",
      "url": "https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11"
    },
    {
      "type": "WEB",
      "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55778"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Parse Server: Stored XSS via non-standard file extension bypassing file upload extension blocklist"
}

CVE-2026-55778 (GCVE-0-2026-55778)

Vulnerability from cvelistv5 – Published: 2026-07-08 20:50 – Updated: 2026-07-09 13:39

Title

Parse Server: Stored XSS via non-standard file extension bypassing file upload extension blocklist

Summary

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.

Severity

2.1 (Low)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-09 13:39 UTC

CWE

CWE-434 - Unrestricted Upload of File with Dangerous Type

Assigner

GitHub_M mitre root

References

7 references

URL	Tags
https://github.com/parse-community/parse-server/s…	x_refsource_CONFIRM
https://github.com/parse-community/parse-server/p…	x_refsource_MISC
https://github.com/parse-community/parse-server/p…	x_refsource_MISC
https://github.com/parse-community/parse-server/c…	x_refsource_MISC
https://github.com/parse-community/parse-server/c…	x_refsource_MISC
https://github.com/parse-community/parse-server/r…	x_refsource_MISC
https://github.com/parse-community/parse-server/r…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
parse-community	parse-server	Affected: >= 9.0.0-alpha.1, < 9.9.1-alpha.11 Affected: < 8.6.81

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-55778",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-09T13:39:32.908358Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-09T13:39:44.881Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "parse-server",
          "vendor": "parse-community",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 9.0.0-alpha.1, \u003c 9.9.1-alpha.11"
            },
            {
              "status": "affected",
              "version": "\u003c 8.6.81"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 2.1,
            "baseSeverity": "LOW",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "PASSIVE",
            "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-434",
              "description": "CWE-434: Unrestricted Upload of File with Dangerous Type",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-08T20:50:52.531Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93"
        },
        {
          "name": "https://github.com/parse-community/parse-server/pull/10505",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/parse-community/parse-server/pull/10505"
        },
        {
          "name": "https://github.com/parse-community/parse-server/pull/10506",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/parse-community/parse-server/pull/10506"
        },
        {
          "name": "https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a"
        },
        {
          "name": "https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50"
        },
        {
          "name": "https://github.com/parse-community/parse-server/releases/tag/8.6.81",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/parse-community/parse-server/releases/tag/8.6.81"
        },
        {
          "name": "https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11"
        }
      ],
      "source": {
        "advisory": "GHSA-v8x7-r927-cc93",
        "discovery": "UNKNOWN"
      },
      "title": "Parse Server: Stored XSS via non-standard file extension bypassing file upload extension blocklist"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55778",
    "datePublished": "2026-07-08T20:50:52.531Z",
    "dateReserved": "2026-06-17T14:40:28.379Z",
    "dateUpdated": "2026-07-09T13:39:44.881Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.