iTop is an web based IT Service Management tool. Prior to versions 2.7.12, 3.1.3, and 3.2.1, anyone with an account having portal access can have read access to objects they're not allowed to see by querying an unprotected route. Versions 2.7.12, 3.1.3, and 3.2.1 contain a fix for the issue.
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.