Whitepaper discussing Flexpaper versions 2.3.6 and below which suffer from a remote code execution vulnerability.
You can download it from the following link: https://packetstormsecurity.com/files/download/152021/Flexpaper.pdf
Source: https://packetstormsecurity.com/files/152021/Flexpaper-2.3.6-Remote-Code-Execution.html