Insufficient input sanitization and output escaping allow unauthenticated attackers to perform Stored Cross-Site Scripting (XSS) via comment content. This is achieved by using a predictable `{rstr keep}` placeholder, enabling the injection of arbitrary web scripts that execute when a user views the affected page. The payload bypasses standard WordPress comment sanitization because the used tags and attributes, such as `a[title]` and `code`, are permitted by the core comment kses allow-list, and the plugin's shortcode markers and placeholder tokens are not removed.