CVE-2026-34735 — Hytale Modding Vulnerable to Remote Code Execution via File Upload Bypass in `FileController`
The Hytale Modding Wiki is a free service for Hytale mods to host their documentation & wikis. In version 1.2.0 and prior, the quickUpload() endpoint validates uploaded files by…
Published: 2026-04-02 · CVSS: 8.7 · CVSS 4.0
The Hytale Modding Wiki is a free service for Hytale mods to host their documentation & wikis. In version 1.2.0 and prior, the quickUpload() endpoint validates uploaded files by checking their MIME type (via PHP's finfo, which inspects file contents) but constructs the stored filename using the client-supplied file extension from getClientOriginalExtension(). These two checks are independent: an attacker can upload a file whose content passes the MIME allowlist while using a .php extension. The file is stored on the public disk and is directly accessible via URL, allowing server-side code execution. At time of publication no known patches exist.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7