I'd say "vulnerable" in this context would be admitting personal / professional weaknesses and significant professional mistakes. In a bad corporate culture, b

I'd say "vulnerable" in this context would be admitting personal / professional weaknesses and significant professional mistakes. In a bad corporate culture, being vulnerable in such a way would be used against you by your peers and managers to damage your political standing and to deny you bonuses, promotions, etc. In a more positive culture, that same knowledge would be used by your peers and managers to use their strengths to cover your weaknesses, help you and others learn from your mistakes, and so forth.