Moodle Improper Neutralization of Special Elements used in an SQL Command (SQL Injection) Vulnerability - CVE-2013-4313
Moodle through 2.2.11 2.3.x before 2.3.9 2.4.x before 2.4.6 and 2.5.x before 2.5.2 does not prevent use of 39039 characters in query strings which might allow remote attackers to conduct SQL injection attacks against Microsoft SQL Server via a crafted string.