A remote code execution risk was identified in the Moodle LMS Dropbox repository. By default this was only available to teachers and managers, on sites with the Dropbox repository enabled. Versions affected: 4.5 to 4.5.3, 4.4 to 4.4.7, 4.3 to 4.3.11, 4.1 to 4.1.17 and earlier unsupported versions. Versions fixed: 4.5.4, 4.4.8, 4.3.12 and 4.1.18