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:*:*:*:*:*:*:*:*"
]
}