CVE-2020-37023 Koken CMS 0.22.24 - Arbitrary File Upload
Authenticated attackers can upload malicious PHP files to Koken CMS, leading to arbitrary code execution on the server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-37023?
CVE-2020-37023 is a high-severity vulnerability in Koken CMS, published on 30 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-434
Which versions are affected by CVE-2020-37023?
How do I fix CVE-2020-37023?
No fix has been published for CVE-2020-37023 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-37023 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-37023 exists.
Sources
Also known as GHSA-jfgg-fv6q-274f.