Authorization bypass in Nagios IM (component of Nagios XI) before 2.2.7 allows closing incidents in IM via the API.
https://www.nagios.com/products/security/
https://euvd.enisa.europa.eu/vulnerability/EUVD-2019-18579
http://packetstormsecurity.com/files/152496/Nagios-XI-5.5.10-XSS-Remote-Code-Execution.html