Disclosing the flaw, even just internally within the company, will almost certainly identify the manager to others inside and outside the company. Does the manager's right to privacy make a difference?

Multiple Choice

It's not unimportant, but serving the greater good is more important.

If others in similar situations have been identifled in the past, then it's acceptable to identify the manager.

Identifying an innocent party who wants to remain anonymous is unethical. Right to privacy should come first.