Bank of 'MURICA (Bo'M) gets a phone call from some random guy (Jack) who identifies a bug in the interface between PoS systems at gas stations across the US, and whatever Bo'M internal software-mega-structure manages checking acct balances for Bo'M customers. Now, Jack is a good Samaritan; he would never use this information to steal from millions of Bo'M customers...but like...he totally could. Jack's sister Jill overhears her brother's conversation with Bo'M's security team, & decides everyone needs to know immediately about Bo'M's negligence.
Lets pretend it's going to take a ~month to fix the interface.
Is it cool for Jill to get on Reddit and post the code necessary to exploit the bug before Bo'M has a chance to protect their customers?
Is this a victimless act? Was she just being responsible? Should she have waited to be responsible?