LimeSurvey version 3.15.5 contains a Cross-site scripting (XSS) vulnerability in Survey Resource zip upload, resulting in Javascript code execution against LimeSurvey administrators. Fixed in version 3.15.6.
https://github.com/LimeSurvey/LimeSurvey/commit/bfee69edaa0b90f97dc2d8fab09a87958cb32405