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.
{
    "nvd_published_at": "2021-10-08T21:15:00Z",
    "severity": "MODERATE",
    "cwe_ids": [
        "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-10-11T20:21:13Z"
}