Abstract: The authors carefully examine such aspects of the topic as the threat to information security for the St. Petersburg municipal authorities within the system of remote financial document management. The authors underline the advantages of the system of remote financial document management, new system introduced in July of 2013 before the system of electronic document management. The article presents information for receiving the qualified certificate of verification key in the federal treasury of St. Petersburg. The individual properties of electronic document management, with the help of which it retains its legal power from the technical point of view, are being reviewed. The main conclusion consists in building a generalized model that describes the conditions under which emerges the threat of “loss of legal power of an electronic document”. The scientific novelty consists in examination of threat with regards to the questions of information security during the transfer of data between the St. Petersburg municipal authorities and the federal treasury.