{"id":"CVE-2026-35200","aliases":["BIT-parse-2026-35200","GHSA-vr5f-2r24-w5hc"],"url":"https://o3.security/vulnerability/CVE-2026-35200","summary":"Parse Server has a file upload Content-Type override via extension mismatch","details":"### Impact\n\nA 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.\n\n### Patches\n\nThe file upload now derives the Content-Type from the filename extension, overriding any user-provided Content-Type when the file has an extension.\n\n### Workarounds\n\nConfigure the storage adapter or CDN to derive Content-Type from the filename extension instead of using the stored Content-Type.","published":"2026-04-06T19:47:27.709Z","modified":"2026-08-12T03:51:38.889504129Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"parse-server","fixedVersion":"9.7.1-alpha.4"},{"ecosystem":"npm","name":"parse-server","fixedVersion":"8.6.73"}],"fix":{"url":"https://github.com/parse-community/parse-server/pull/10383","label":"parse-community/parse-server#10383"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35200.json"},{"type":"ADVISORY","url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-vr5f-2r24-w5hc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35200"},{"type":"FIX","url":"https://github.com/parse-community/parse-server/pull/10383"},{"type":"FIX","url":"https://github.com/parse-community/parse-server/pull/10384"},{"type":"PACKAGE","url":"https://github.com/parse-community/parse-server"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:38.889504129Z"}}