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.

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

EPSS: 0.006 (45.3th percentile) — read the EPSS interpretation.

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.

Affected products

The Textpattern Development Team — versions 4.8.3

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (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.