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.

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Solution

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History

Thu, 02 Apr 2026 20:30:00 +0000

Type Values Removed Values Added
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.
Title Hytale Modding Vulnerable to Remote Code Execution via File Upload Bypass in `FileController`
Weaknesses CWE-434
References
Metrics cvssV4_0

{'score': 8.7, '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'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-04-02T19:14:04.735Z

Reserved: 2026-03-30T18:41:20.754Z

Link: CVE-2026-34735

cve-icon Vulnrichment

Updated: 2026-04-02T19:14:00.137Z

cve-icon NVD

Status : Received

Published: 2026-04-02T19:21:32.723

Modified: 2026-04-02T19:21:32.723

Link: CVE-2026-34735

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses