Kibana contains an embedded version of the Chromium browser that the Reporting feature uses to generate the downloadable reports. If a user with permissions to generate reports is able to render arbitrary HTML with this browser, they may be able to leverage known Chromium vulnerabilities to conduct further attacks. Kibana contains a number of protections to prevent this browser from rendering arbitrary content.
Exploitability
AV:NAC:HPR:HUI:NScope
S:UImpact
C:HI:HA:H6.6/CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:HOther