GHSA-C3MP-9VX3-2RVV OpenNMS Horizon RCE via JEXL2 expression

OpenNMS Meridian 2016, 2017, 2018 before 2018.1.25, 2019 before 2019.1.16, and 2020 before 2020.1.5, Horizon 1.2 through 27.0.4, and Newts 1.5.3 has Incorrect Access Control, which allows local and remote code execution using JEXL expressions...