AlekSIS-Core is vulnerable to Incorrect Access Control. Unauthenticated users can access all PDF files. This affects AlekSIS-Core 3.0, 3.1, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.5, 3.1.6, 3.2.0 and 3.2.1.
https://edugit.org/AlekSIS/official/AlekSIS-Core/-/issues/1180