There is a remote code execution vulnerability in SeaCMS 12.9. The vulnerability is caused by phomebak.php writing some variable names passed in without filtering them before writing them into the php file. An authenticated attacker can exploit this vulnerability to execute arbitrary commands and obtain system permissions.
The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.