The "File upload question" functionality in LimeSurvey 3.x-LTS through 3.27.18 allows XSS in assets/scripts/modaldialog.js and assets/scripts/uploader.js.
{ "severity": "Medium", "cpes": [ "cpe:2.3:a:limesurvey:limesurvey:*:*:*:*:*:*:*:*" ] }