PHP remote file inclusion vulnerability in custom_vars.php in GlossWord 1.8.1 allows remote attackers to execute arbitrary PHP code via a URL in the sys[path_addon] parameter.

Glossword 1.8.8 - 1.8.12 Arbitrary File Upload RCE

Glossword versions 1.8.8 through 1.8.12 contain an authenticated arbitrary file upload vulnerability. When deployed as a standalone application, the administrative interface (gw_admin.php) allows users with administrator privileges to upload files to the gw_temp/a/ directory. Due to insufficient validation of file type and path, attackers can upload and execute PHP payloads, resulting in remote code execution.