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 (/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, which is evaluated by the template engine. Accordingly, unauthenticated attackers can inject and execute arbitrary PHP code by providing crafted template strings.
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