Parse Server has a stored XSS filter bypass via Content-Type MIME parameter and missing XML extension blocklist entries

Impact An attacker who is allowed to upload files can bypass the file extension filter by appending a MIME parameter e.g. ;charset=utf-8 to the Content-Type header. This causes the extension validation to fail matching against the blocklist, allowing active content to be stored and served under t...

PT-2026-25823

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.15 and 8.6.41, an attacker who is allowed to upload files can bypass the file extension filter by appending a MIME parameter e.g. ;charset=utf-8 to the Content-Type header...