OpenEMR is a free and open source electronic health records and medical practice management application. Prior to version 8.0.0.3, an Insecure Direct Object Reference (IDOR) vulnerability in the fee sheet product save logic ("library/FeeSheet.class.php") allows any authenticated user with fee sheet ACL access to delete, modify, or read "drug_sales" records belonging to arbitrary patients by manipulating the hidden "prod[][sale_id]" form field. The "save()" method uses the user-supplied "sale_id" in five SQL queries (SELECT, UPDATE, DELETE) without verifying that the record belongs to the current patient and encounter. Version 8.0.0.3 contains a patch.