In Moodle 3.x, there is XSS in the assignment submission page.

In Moodle 2.x and 3.x, there is incorrect sanitization of attributes in forums.

In Moodle 2.x and 3.x, the capability to view course notes is checked in the wrong context.

In Moodle 2.x and 3.x, non-admin site managers may accidentally edit admins via web services.

In Moodle 2.x and 3.x, the question engine allows access to files that should not be available.

In Moodle 2.x and 3.x, web service tokens are not invalidated when the user password is changed or forced to be changed.

In Moodle 2.x and 3.x, an unenrolled user still receives event monitor notifications even though they can no longer access the course.

In Moodle 2.x and 3.x, text injection can occur in email headers, potentially leading to outbound spam.

In Moodle 3.x, glossary search displays entries without checking user permissions to view them.

Cross-site scripting (XSS) vulnerabilities in Moodle CMS on or before 3.1.2 allow remote attackers to inject arbitrary web script or HTML via the s_additionalhtmlhead, s_additionalhtmltopofbody, and s_additionalhtmlfooter parameters.

Unrestricted file upload vulnerability in the double extension support in the "image" module in Moodle 3.1.2 allows remote authenticated users to execute arbitrary code by uploading a file with an executable extension, and then accessing it via unspecified vectors.

Unrestricted file upload vulnerability in the "legacy course files" and "file manager" modules in Moodle 3.1.2 allows remote authenticated users to execute arbitrary code by uploading a file with an executable extension, and then accessing it via unspecified vectors.