CVE-2020-37023 HIGH

CVE-2020-37023: Koken CMS 0.22.24 - Arbitrary File Upload

Vendor Koken
Product Koken CMS
Weakness CWE-434 · Unrestricted file upload
Published January 30, 2026
Last update February 3, 2026

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 30, 2026 CVE published
February 3, 2026 Record updated