Secunia

DCP-Portal includes files in an insecure way, this allows inclusion of arbitrary php code.

The $root parameter is used to include certain files. This allows malicious users to include arbitrary code.

The cookie dcp5_member_id only needs to be set to get access to the members area and dcp5_member_admin must be set to "5" and you have full administrative access.

Solution
Edit the source code so that the path is hardcoded or can't be supplied by the user. Edit the source code so that it verifies if the user / session ID exists and protect the admin directory with .htaccess or similar.
Further details available in Customer Area

Provided and/or discovered by
Frog Man

Deep Links
Links available in Customer Area