Cross-site scripting (XSS) vulnerability in mod/quiz/report/responses/responses_table.php in Moodle through 2.2.11, 2.3.x before 2.3.10, 2.4.x before 2.4.7, and 2.5.x before 2.5.3 allows remote authenticated users to inject arbitrary web script or HTML via an answer to a text-based quiz question.