CVE-2019-3809: Moodle

Critical severity, CVSS 10.0. EPSS: 0.8% chance of exploitation in the next 30 days.

A flaw was found in Moodle versions 3.1 to 3.1.15 and earlier unsupported versions. The mybackpack functionality allowed setting the URL of badges, when it should be restricted to the Mozilla Open Badges backpack URL. This resulted in the possibility of blind SSRF via requests made by the page.

Affected products

• Moodle Moodle: from 3.1.0, up to and including 3.1.15

Published 2019-03-25. Last modified 2026-06-17.