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Vulnerability record · CVE-2020-37023 · published 30 January 2026

CVE-2020-37023: Unrestricted file upload vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.64% · top 51.5% CWE-434 · Unrestricted file upload Deferred
8.7CVSS 4.0 base score
0.64%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
http://koken.me/
https://github.com/V1n1v131r4/Bypass-File-Upload-on-Koken-CMS/blob/master/README.md
https://www.exploit-db.com/exploits/48706
https://www.softaculous.com/apps/cms/Koken
https://www.vulncheck.com/advisories/koken-cms-arbitrary-file-upload

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Source: NIST National Vulnerability Database (record CVE-2020-37023), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.