CVE-2018-1137: Moodle

High severity, CVSS 8.1. EPSS: 1.6% chance of exploitation in the next 30 days.

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.

Affected products

• Moodle Moodle: from 3.1.0, up to and including 3.1.11; from 3.2.0, up to and including 3.2.8; from 3.3.0, up to and including 3.3.5; from 3.4.0, up to and including 3.4.2

Published 2018-05-25. Last modified 2026-06-17.