CVE-2020-37023

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 v4.0

8.7 HIGHCVSS: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:X/V:X/RE:X/U:X

CVSS v3.1

8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.62% chance of exploitation in the next 30 days, 48th percentile

Published

2026-01-30

Updated

2026-02-03

Proof-of-concept exploits (2)

• https://www.exploit-db.com/exploits/48706
• V1n1v131r4/Bypass-File-Upload-on-Koken-CMS/blob/master/README.md

References

• CVE Record
• NVD entry

Related

• CVE-2017-7317
• CVE-2019-19889
• CVE-2019-19890
• CVE-2019-19916
• CVE-2019-20203
• CVE-2019-20204