Embodiments of the present invention provide a method, system and computer program product for supporting weak password authentication in a multi-user application environment. In an embodiment of the invention, a method for supporting weak password authentication in a multi-user application environment can be provided. The method can include acquiring log in data for a log in attempt by an end user amongst end users in a multi-user application. The method also can include messaging the log in data to others of the end users for subjective analysis by the others of the end users in detecting an unauthorized log in attempt.