CVE-2026-34735 Details
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.
A remote code execution vulnerability exists in the Hytale Modding Wiki, specifically in version 1.2.0 and prior. The issue arises in the 'quickUpload()' endpoint, which validates uploaded files by checking their MIME type using PHP's 'finfo' function. However, the endpoint constructs the stored filename based on the client-supplied file extension, allowing an attacker to upload a file that bypasses the MIME allowlist by disguising it as an allowed type while using a .php extension. The uploaded file is saved on the public disk, accessible via URL, and can execute server-side code. This vulnerability has been confirmed on a local instance, where the full exploitation chain, from file upload to database exfiltration, was demonstrated.
Users are advised to update to version 1.1.2, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Apr 2, 2026CISA-ADP
Assessed Apr 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/HytaleModding/wiki/security/advisories/GHSA-2xqq-6778-h4j9 | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-434 | Unrestricted Upload of File with Dangerous Type | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Hytale Modding Wiki | All versions |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 2, 2026 | New CVE Received | [email protected] |