File Upload Bypass in Koken CMS 0.22.24 Enables Remote Code Execution

Publication date: 2026-01-30

Last updated on: 2026-01-30

Assigner: VulnCheck

Description

Koken CMS 0.22.24 contains a file upload vulnerability that allows authenticated attackers to bypass file extension restrictions by renaming malicious PHP files. Attackers can upload PHP files with system command execution capabilities by manipulating the file upload request through a web proxy and changing the file extension.

CVSS Scores

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Meta Information

Published

2026-01-30

Last Modified

2026-01-30

Generated

2026-07-06

AI Q&A

2026-01-31

EPSS Evaluated

2026-07-05

NVD

CVE-2020-37023

Affected Vendors & Products

Vendor	Product	Version / Range
koken	cms	0.22.24

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-434	The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

Attack-Flow Graph

Executive Summary

This vulnerability in Koken CMS 0.22.24 allows authenticated attackers to bypass file extension restrictions during file uploads. By renaming malicious PHP files and manipulating the file upload request through a web proxy, attackers can upload PHP files that execute system commands on the server.

Impact Analysis

The vulnerability can lead to remote code execution on the server hosting Koken CMS, allowing attackers to run arbitrary system commands. This can compromise the server's security, potentially leading to data theft, server control loss, or further attacks within the network.

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