What is the ruling on one who invests his private money into the capital of a Mudarabah company and takes his own profit without the knowledge of the capital owner?

In investment contracts such as Musharakah (partnership) and Mudarabah (profit-sharing), the presence and knowledge of both parties to the contract are essential, as this is the basis of offer and acceptance.

If the Mudarib (investing partner) introduces his own capital to the capital of the Rabb al-Mal (capital provider) in Mudarabah without the knowledge of the Rabb al-Mal, this is not permissible unless the Rabb al-Mal grants him permission to act according to his own judgment.