CVE-2021-47976 TextPattern CMS 4.9.0-dev Authenticated Remote Code Execution via Plugin Upload
Authenticated attackers can upload malicious PHP files via the plugin upload feature to achieve remote code execution on 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-2021-47976?
CVE-2021-47976 is a high-severity vulnerability in TextPattern CMS, published on 16 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
TextPattern CMS 4.9.0-dev contains a remote code execution vulnerability that allows authenticated attackers to upload arbitrary PHP files by exploiting the plugin upload functionality. Attackers can authenticate, retrieve a CSRF token from the plugin event page, and upload malicious PHP files to the textpattern/tmp/ directory for code execution.
Weakness: CWE-352
Which versions are affected by CVE-2021-47976?
How do I fix CVE-2021-47976?
No fix has been published for CVE-2021-47976 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-47976 being exploited?
There is no known exploitation of CVE-2021-47976 in the wild and no public exploit code.
Sources
Also known as GHSA-77f2-mm55-xvp4.