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Parse Server has a file upload Content-Type override via extension mismatch

Type: advisorySources: OSV

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.73 and 9.7.1-alpha.4, a file can be uploaded with a filename extension that passes the file extension allowlist (e.g., .txt) but with a Content-Type header that differs from the extension (e.g., text/html). The Content-Type is passed to the storage adapter without consistency validation. Storage adapters that store and serve the provided Content-Type (such as S3 or GCS) serve the file with the mismatched Content-Type. The default GridFS adapter is not affected because it derives Content-Type from the filename at serving time. This vulnerability is fixed in 8.6.73 and 9.7.1-alpha.4.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-35200
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 16:24 UTC · Revision 1

Source evidence

Parse Server has a file upload Content-Type override via extension mismatch

core-osv · Original source

Published 6 Apr 2026, 19:47 UTC

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.73 and 9.7.1-alpha.4, a file can be uploaded with a filename extension that passes the file extension allowlist (e.g., .txt) but with a Content-Type header that differs from the extension (e.g., text/html). The Content-Type is passed to the storage adapter without consistency validation. Storage adapters that store and serve the provided Content-Type (such as S3 or GCS) serve the file with the mismatched Content-Type. The default GridFS adapter is not affected because it derives Content-Type from the filename at serving time. This vulnerability is fixed in 8.6.73 and 9.7.1-alpha.4.

osv:CVE-2026-35200
Complete source record
{
  "id": "720579be9f2ff26eab1645ef06341e2fe876dbef37ee395db16ba085114c6ad4",
  "url": "https://osv.dev/vulnerability/CVE-2026-35200",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Parse Server has a file upload Content-Type override via extension mismatch",
    "summary": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.73 and 9.7.1-alpha.4, a file can be uploaded with a filename extension that passes the file extension allowlist (e.g., .txt) but with a Content-Type header that differs from the extension (e.g., text/html). The Content-Type is passed to the storage adapter without consistency validation. Storage adapters that store and serve the provided Content-Type (such as S3 or GCS) serve the file with the mismatched Content-Type. The default GridFS adapter is not affected because it derives Content-Type from the filename at serving time. This vulnerability is fixed in 8.6.73 and 9.7.1-alpha.4.",
    "evidence": "osv:CVE-2026-35200",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-35200",
      "aliases": [
        "BIT-parse-2026-35200",
        "CVE-2026-35200",
        "GHSA-vr5f-2r24-w5hc"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
        }
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      "affected": [
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              "repo": "https://github.com/parse-community/parse-server",
              "type": "GIT",
              "events": [
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                {
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              "database_specific": {
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                    "cpe": "cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*",
                    "range": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35200.json"
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      ],
      "modified": "2026-10-28T02:30:21.347737099Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35200.json",
        "https://github.com/parse-community/parse-server/security/advisories/GHSA-vr5f-2r24-w5hc",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-35200",
        "https://github.com/parse-community/parse-server/pull/10383",
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      ],
      "provider_metadata": {
        "cwe_ids": [
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        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35200.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-35200",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487071,
  "published_at": "2026-04-06T19:47:27.709+00:00"
}