Textpattern 4.8.3 - Remote code execution | Advisories

Advisories

Textpattern 4.8.3 - Remote code execution

severity: high
date: January 22, 2026
Affecting: Textpattern 4.8.3
CVE: CVE-2021-47888
CWE: CWE-434 Unrestricted Upload of File with Dangerous Type
CVSS: 8.7
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References: ExploitDB-49620
Official Vendor Homepage
Textpattern Software Download Page
Credit: Ricardo Ruiz (@ricardojoserf)
Description: 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.