CVE-2021-36396: Moodle

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

In Moodle, insufficient redirect handling made it possible to blindly bypass cURL blocked hosts/allowed ports restrictions, resulting in a blind SSRF 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.