An issue was discovered in Tiny Issue 1.3.1 and pixeline Bugs through 1.3.2c. install/config-setup.php allows remote attackers to execute arbitrary PHP code via the database_host parameter if the installer remains present in its original directory after installation is completed.
https://github.com/pixeline/bugs/commit/9d2d3fcdea22e94f7b497f6ed83791ab3a31ee41