Invision Community through 4.7.16 allows remote code execution via the applications/core/modules/admin/editor/toolbar.php IPS\core\modules\admin\editor\toolbar::addPlugin() method. This method handles uploaded ZIP files that are extracted into the applications/core/interface/ckeditor/ckeditor/plugins/ directory without properly verifying their content. This can be exploited by admin users (with the toolbarmanage permission) to write arbitrary PHP files into that directory, leading to execution of arbitrary PHP code in the context of the web server user.

Invision Community 5.0.0 before 5.0.7 allows remote code execution via crafted template strings to themeeditor.php. The issue lies within the themeeditor controller (file: /applications/core/modules/front/system/themeeditor.php), where a protected method named customCss can be invoked by unauthenticated users. This method passes the value of the content parameter to the Theme::makeProcessFunction() method; hence it is evaluated by the template engine. Accordingly, this can be exploited by unauthenticated attackers to inject and execute arbitrary PHP code by providing crafted template strings.