Teachers exporting a forum in CSV format could receive a CSV of forums from all courses in some circumstances. Moodle versions 3.8.x prior to 3.8.9, 3.9.x prior to 3.9.7, and 3.10.x prior to 3.10.4.
CWE-862 - Missing Authorization
The missing authorization vulnerability occurs when a software program allows users to access privileged parts of the program without verifying the user credentials. Impact of such a vulnerability depends on the resources employed by the software, ranging from account takeover to sensitive information exposure, denial of service, and complete system takeover.