Icinga Web 2 before 2.6.2 allows parameters that break navigation dashlets, as demonstrated by a single '$' character as the Name of a Navigation item.
https://herolab.usd.de/wp-content/uploads/sites/4/2018/12/usd20180030.txt
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00031.html