OMGF < 6.3.11 - Unauthenticated Stored XSS via 's' Parameter in comments-atom Feed

Description

The plugin is vulnerable to Stored Cross-Site Scripting via the 's' search parameter in the comments-atom feed due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Successful exploitation requires that the front-end server serves the retained .tmp file without a Content-Type or X-Content-Type-Options header, enabling MIME-sniffing browsers such as Chromium to execute the injected script - a condition present by default on many Apache and nginx/php-fpm deployments.