Invision Community (aka IPS Community Suite) before 4.6.0 allows eval-based PHP code injection by a moderator because the IPS\cms\modules\front\pages\_builder::previewBlock method interacts unsafely with the IPS\_Theme::runProcessFunction method.
https://invisioncommunity.com/features/security/
https://hackerone.com/reports/1092574
http://seclists.org/fulldisclosure/2021/May/80
http://packetstormsecurity.com/files/162868/IPS-Community-Suite-4.5.4.2-PHP-Code-Injection.html