Moodle Exposure of Sensitive Information to an Unauthorized Actor Vulnerability - CVE-2013-2243
mod/lesson/pagetypes/matching.php in Moodle through 2.2.11 2.3.x before 2.3.8 2.4.x before 2.4.5 and 2.5.x before 2.5.1 allows remote authenticated users to obtain sensitive answer information by reading the HTML source code of a document.