The 2020 Corruption index has marked Lebanon as highly corrupt and ranked it 149th (out of 180) with a score of 25/100. Other countries with a similar ranking include Iran, Guatemala, Nigeria, Mozambique and Cameroon. As far as Arab countries are concerned, UAE is the least corrupt country followed by Qatar, Oman & Saudi Arabia.
Here are the rankings of Arab countries:
United Arab Emirates 21
Saudi Arabia 52
South Sudan 179