The vulnerability centers on improper authorization checks for reporting features. Mattermost's analytics endpoints would logically be handled in API handlers (api4 package) calling core analytics logic (app package). The pattern matches Go project structure where api4 handles HTTP layer and app handles business logic. High confidence comes from: 1) The vulnerability manifests in statistics access 2) Authorization must be checked at both API and app layers 3) 'Viewer role with No Access to Reporting' implies missing check between role assignment and permission flags during statistics retrieval.