We have updated our Community Code of Conduct. Please read through the new rules for the forum that are an integral part of Paradox Interactive’s User Agreement.
You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
Not to exploit it, but because "how to exploit it" probably answers the question of "how to reproduce the issue", which would simplify fixing the issue.
Fixed in code now so it should be in next patch. Basically, there were no bounds checks in gameplay code against other code (e.g. AI) setting some crazy value for colonial maintenance.