CVE-2023-35133: Moodle

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

An issue in the logic used to check 0.0.0.0 against the cURL blocked hosts lists resulted in an SSRF risk. This flaw affects Moodle versions 4.2, 4.1 to 4.1.3, 4.0 to 4.0.8, 3.11 to 3.11.14, 3.9 to 3.9.21 and earlier unsupported versions.

Affected products

• Moodle Moodle: before 3.9.22 (fixed in 3.9.22); from 3.11.0, before 3.11.15 (fixed in 3.11.15); from 4.0.0, before 4.0.9 (fixed in 4.0.9); from 4.1.0, before 4.1.4 (fixed in 4.1.4); version 4.2.0 only

Published 2023-06-22. Last modified 2026-06-17.