Arbitrary file upload in The Textpattern Development Team
CVE-2021-47888
Textpattern versions prior to 4.8.3 contain an authenticated remote code execution vulnerability that allows logged-in users to upload malicious PHP files. Attackers can upload a PHP file with a shell command execution payload and execute arbitrary commands by accessing the uploaded file through a specific URL parameter.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.001
Affected products
- The Textpattern Development Team — versions 4.8.3
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/49620 (exploit)
- textpattern.com/ (product)
- textpattern.com/start (product)
- www.vulncheck.com/advisories/textpattern-remote-code-execution (third-party-advisory)
Frequently asked questions
- What is CVE-2021-47888?
- CVE-2021-47888 is a high-severity vulnerability in The Textpattern Development Team, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2026-01-23.
- How severe is CVE-2021-47888?
- High severity. CVSS v3 base score is 8.8 out of 10.