CVE-2026-35200

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.

Affected products

Gcs, Parse Server, S3

Parseplatform Parse-server

< 8.6.73, 9.7.1

Fix

Available

CVSS 3.1

5.4 MEDIUM

EPSS

0.2% (6th percentile)

Weakness

CWE-436

NVD status

Analyzed

Published

2026-04-06

No exploit for CVE-2026-35200 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.