CVE-2025-67853: Moodle

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

A flaw was found in Moodle. A remote attacker could exploit a lack of proper rate limiting in the confirmation email service. This vulnerability allows attackers to more easily enumerate or guess user credentials, facilitating brute-force attacks against user accounts.

Affected products

• Moodle Moodle: before 4.1.22 (fixed in 4.1.22); from 4.4.0, before 4.4.11 (fixed in 4.4.11); from 4.5.0, before 4.5.8 (fixed in 4.5.8); from 5.0.0, before 5.0.4 (fixed in 5.0.4); version 5.1.0 only

Published 2026-02-03. Last modified 2026-06-17.