[jacobolus]

A high school friend (2 decades ago) told a teacher that the system keeping track of student grades was vulnerable to attack. The teacher asked the student to demonstrate by attacking the system and adjusting one of his test scores down by 1 point. My friend obliged, and the teacher reported the vulnerability to the administration. An administrator threatened my friend with expulsion, but when he proposed to go public with his story in response, they decided they wouldn't expel him. The resolution was "please don't tell anyone", and the vulnerability was never fixed.