Icinga Web 2 before 2.6.2 allows injection of PHP ini-file directives via vectors involving environment variables as the channel to send information to the attacker, such as a name=${PATH}_${APACHE_RUN_DIR}_${APACHE_RUN_USER} parameter to /icingaweb2/navigation/add or /icingaweb2/dashboard/new-dashlet.
https://herolab.usd.de/wp-content/uploads/sites/4/2018/12/usd20180030.txt
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00031.html