An issue was discovered in Moodle 3.x. By substituting URLs in portfolios, users can instantiate any class. This can also be exploited by users who are logged in as guests to create a DDoS attack.

An issue was discovered in Moodle 3.x. An authenticated user is allowed to add HTML blocks containing scripts to their Dashboard; this is normally not a security issue because a personal dashboard is visible to this user only. Through this security vulnerability, users can move such a block to other pages where they can be viewed by other users.

An issue was discovered in Moodle 3.x. Students who posted on forums and exported the posts to portfolios can download any stored Moodle file by changing the download URL.

An issue was discovered in Moodle 3.x. Students who submitted assignments and exported them to portfolios can download any stored Moodle file by changing the download URL.

An issue was discovered in Moodle 3.x. A Teacher creating a Calculated question can intentionally cause remote code execution on the server, aka eval injection.

A flaw was found in Moodle 3.4 to 3.4.1, 3.3 to 3.3.4, 3.2 to 3.2.7, 3.1 to 3.1.10 and earlier unsupported versions. Unauthenticated users can trigger custom messages to admin via paypal enrol script. Paypal IPN callback script should only send error emails to admin after request origin was verified, otherwise admin email can be spammed.

In Moodle 3.x, there is XSS via a calendar event name.

In Moodle 3.x, quiz web services allow students to see quiz results when it is prohibited in the settings.

Moodle 3.x has Server Side Request Forgery in the filepicker.

In Moodle 3.x, students can find out email addresses of other students in the same course. Using search on the Participants page, students could search email addresses of all participants regardless of email visibility. This allows enumerating and guessing emails of other students.

In Moodle 3.x, various course reports allow teachers to view details about users in the groups they can't access.

Moodle 3.x has XSS in the contact form on the "non-respondents" page in non-anonymous feedback.

In Moodle 3.x, course creators are able to change system default settings for courses.

Moodle 3.x has user fullname disclosure on the user preferences page.

In Moodle 2.x and 3.x, a CSRF attack is possible that allows attackers to change the "number of courses displayed in the course overview block" configuration setting.

In Moodle 2.x and 3.x, searching of arbitrary blogs is possible because a capability check is missing.

In Moodle 2.x and 3.x, remote authenticated users can take ownership of arbitrary blogs by editing an external blog link.

In Moodle 3.x, XSS can occur via attachments to evidence of prior learning.

In Moodle 3.x, XSS can occur via evidence of prior learning.

In Moodle 2.x and 3.x, SQL injection can occur via user preferences.