HytaleModding wiki up to 1.2.0 File Extension quickUpload unrestricted upload

Summaryinfo

A vulnerability has been found in HytaleModding wiki up to 1.2.0 and classified as critical. This vulnerability affects the function quickUpload of the component File Extension Handler. This manipulation causes unrestricted upload. This vulnerability appears as CVE-2026-34735. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in HytaleModding wiki up to 1.2.0 and classified as critical. Affected by this vulnerability is the function quickUpload of the component File Extension Handler. The manipulation with an unknown input leads to a unrestricted upload vulnerability. The CWE definition for the vulnerability is CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-34735 since 03/30/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/02/2026). MITRE ATT&CK project uses the attack technique T1608.002 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Content Management System

Vendor

• HytaleModding

Name

• wiki

Version

• 1.0
• 1.1
• 1.2.0

Website

• Product: https://github.com/HytaleModding/wiki/

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