No matter how your interview experience is, keep it professional and drop them an email via an official channel, if possible include also interested parties inf

No matter how your interview experience is, keep it professional and drop them an email via an official channel, if possible include also interested parties informing them "Hey during the interview we faced issue X and I raised my concerns but it was bugging me, so to make sure I am dropping you an email with the below details, since double check better than to be sorry". Maybe recruiter was in hurry during interview and didnt give enough attention or maybe another candidate heard the vulnerability or the worst case scenario in future someone in luck found same weakness but used to damage company, instead of bothering yourself, let them deal with it.