CVE-2026-34735
HighCVSS 8.7Exploitation Probability (EPSS)
Low risk23th percentile - higher than 23% of all known CVEs
Summary
Hytale Modding Wiki version 1.2.0 and earlier has a vulnerability in the quickUpload() endpoint. The MIME type is checked, but the filename is constructed from the client-supplied extension. An attacker can upload a PHP file that gets executed server-side.
Risk Assessment
An attacker can achieve remote code execution on the server, leading to full system compromise and data access.
Recommendation
Apply a security patch as soon as it becomes available. Temporarily disable the quickUpload() endpoint or enforce safe file extensions.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

