CVE-2021-36401: Moodle

Medium severity, CVSS 4.8. EPSS: 0.5% chance of exploitation in the next 30 days.

In Moodle, ID numbers exported in HTML data formats required additional sanitizing to prevent a local stored XSS risk.

Affected products

• Moodle Moodle: before 3.9.8 (fixed in 3.9.8); from 3.10.0, before 3.10.5 (fixed in 3.10.5); from 3.11.0, before 3.11.1 (fixed in 3.11.1)

Published 2023-03-06. Last modified 2026-06-17.