PT-2026-29870 · Hytalemodding · Wiki

Liamsystems · Published 2026-04-02 · Updated 2026-04-02 · CVE-2026-34735

NVD

CVSS v4.0

8.7

High

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

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.

Fix

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

CVE-2026-34735

Affected Products

Wiki

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-34735 · Security Note
• https://github.com/HytaleModding/wiki/security/advisories/GHSA-2xqq-6778-h4j9 · Note