CVE-2026-34735

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Source
https://cve.org/CVERecord?id=CVE-2026-34735
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34735.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-34735
Aliases
  • GHSA-2xqq-6778-h4j9
Published
2026-04-02T18:23:26.441Z
Modified
2026-07-27T03:56:14.724502669Z
Severity
  • 8.7 (High) CVSS_V4 - 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 CVSS Calculator
Summary
Hytale Modding Vulnerable to Remote Code Execution via File Upload Bypass in `FileController`
Details

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.

Database specific 
{
    "cwe_ids": [
        "CWE-434"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34735.json"
}
References

Affected packages

Git / github.com/hytalemodding/wiki

Affected ranges

Type
GIT
Repo
https://github.com/hytalemodding/wiki
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
89dfb32585acb1978259287295ddf5ec96e191c3
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "1.2.0"
        }
    ]
}

Affected versions

v1.*
v1.0.0
v1.1.0
v1.2.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34735.json"