Endemic in too many places and will always be with us.
Now, I know people have different definitions of "corruption." In the west, what we see as corruption may be business as usual in other countries. Either way, it hurts the common citizen. The only way to fight it is constant vigilance through strong institutions and cooperation across borders.
A great example is the Magintsky Act, that has recently passed in the U.S. and similar measures being taken in the U.K. and Canada. It allows these countries to seize Russian assets in response to Putin's killing of political opponents. I highly recommend the book Red Notice by Bill Browder.