it depends on who this "third party" is. If it is a Revenue agency from your country which is monitoring income of the citizens aboard, i think it became legal lately.. no more :tax heaven" any more, everyone has to declare all his/her income. Especially such venal banks as HSBC, no wondering.. I never liked them anyway...
If this is not connected to the Income Tax monitoring, it supoose to be considered as a crime i guess...