Moodle Drag-and-Drop Question Type Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the drag-and-drop onto image question type within Moodle. This issue arises from insufficient sanitization of drop zone label text, which can be exploited to inject malicious HTML. The vulnerability affects Moodle versions 4.5 prior to 4.5.1, 4.4 prior to 4.4.5, 4.3 prior to 4.3.9, 4.1 prior to 4.1.15, and earlier unsupported versions.

Impact

Exploitation of this vulnerability allows for stored cross-site scripting, where injected scripts are executed in the context of the user.

Remediation

Users can upgrade to Moodle versions 4.5.2, 4.4.6, 4.3.10, or 4.1.16 to address this vulnerability.