CVE-2021-47943 TextPattern CMS 4.8.7 Remote Code Execution via File Upload
Authenticated attackers can execute arbitrary commands by uploading malicious PHP files via the file upload feature in Textpattern CMS.
- 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-2021-47943?
CVE-2021-47943 is a high-severity vulnerability in TextPattern CMS, published on 10 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
TextPattern CMS 4.8.7 contains a remote code execution vulnerability that allows authenticated attackers to execute arbitrary commands by uploading malicious PHP files through the file upload functionality. Attackers can upload a PHP shell via the Files section in the content area and execute commands by accessing the uploaded file at /textpattern/files/ with GET parameters passed to the system function.
Weakness: CWE-434
Which versions are affected by CVE-2021-47943?
How do I fix CVE-2021-47943?
No fix has been published for CVE-2021-47943 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-47943 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47943 exists.
Sources
Also known as GHSA-3fw2-x5r9-x34j.