EUVD-2026-18499CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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Description
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.
Analysis
Remote code execution in Hytale Modding Wiki version 1.2.0 and earlier allows authenticated users to upload malicious PHP files through a MIME type validation bypass. The quickUpload() endpoint performs independent validation of file content (via MIME type) and filename extension, enabling attackers to craft files with benign content signatures but executable .php extensions. …
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Remediation
Within 24 hours: Identify all systems running Hytale Modding Wiki 1.2.0 or earlier and take them offline or restrict network access to trusted IPs only; audit upload directories for suspicious .php files. Within 7 days: Contact Hytale development for patch timeline; implement Web Application Firewall (WAF) rules to block .php uploads and monitor the quickUpload() endpoint for anomalous activity. …
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