Incorrect access control in Chamilo v1.11.x up to v1.11.18 allows a student to arbitrarily access and modify another student's personal notes.
https://github.com/chamilo/chamilo-lms/commit/f9a17bfaf05994383bca5f4b65eb6897acc60d41
https://github.com/chamilo/chamilo-lms/commit/19af444d2da9e5a60f02b4ebe7755cdff36709cd