Feedback received from users regarding potential problems with an application, service, or other source of electronic content can be configured to include additional information that help triangulate the source of the problem. Content provided by third parties can be combined with content from a primary provider, but the primary provider often will be unable to determine the precise instance of third party content that a user received that might have posed a problem for the user, as may relate to malware or another such issue. By configuring feedback submissions from users to automatically include identifying information, and by logging session data for various users, a content provider can analyze and filter the data to determine likely sources of the problem, and deactivate or otherwise address those sources. Further, the content provider can analyze the information to locate any users likely to have been exposed to the same third party content.