An approach is disclosed that provides a security and authentication daisy chain analysis and warning system to a user. The approach monitors sets of user authentication data pertaining network sites used by the user. Each of the sets of user authentication data is used by the user to access one of the sites. The approach gathers outputs displayed by many network sites, including those network sites accessed by the user. The first set of network sites is a subset of the second set of network sites. An analytical analysis is performed based on the sets of user authentication data and the gathered outputs. Based on the analytical analysis, the user can be alerted regarding security vulnerabilities. The vulnerabilities can correspond to one of the gathered outputs displayed at one network site matching at least a portion of one of the sets of the user's authentication data.