XSS exists in NagVis before 1.9.38 via the select function in share/server/core/functions/html.php.
https://github.com/NagVis/nagvis/pull/356/commits/d660591b23e5cfea4d1be2d3fb8f3855aa6020fb
https://github.com/NagVis/nagvis/pull/356
https://github.com/NagVis/nagvis/compare/nagvis-1.9.37...nagvis-1.9.38