Question: What is your ruling on getting one's work done through bribery?
Answer: If someone's duty is to do a job without getting money but he does not do it without receiving it, giving money to get something done is permissible but it is haram for the recipient to use the money.
Yes, there are cases where bribery is Haram (forbidden), for example, in judiciary cases bribing the judge.
Ayatollah Al-Sayyid Ali Al-Husseini Al-Sistani