I work as a freelancer so sometimes I have access to people or more kudos than the full time staff (sometimes completely the opposite).

Regardless of the situation, I highlight any concerns through the appropriate channels, I ensure that I document the issue(s) along with my response to it/them and leave it to the appropriate people and processes to deal with it. When necessary and applicable I will remind the appropriate people of such things being outstanding (even if it is unpopular). Apart from that, I have done all that is required of me and all that is open to me.

Anything beyond that leaves myself at risk to accusations of all sorts; hacking, wasting company time, breach of contract etc.