The Subscribe to Comments plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 2.3. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

A vulnerability, which was classified as problematic, was found in Subscribe to Comments Plugin up to 2.0.7 on WordPress. This affects an unknown part of the file subscribe-to-comments.php. The manipulation leads to cross site scripting. It is possible to initiate the attack remotely. Upgrading to version 2.0.8 is able to address this issue. The identifier of the patch is 9683bdf462fcac2f32b33be98f0b96497fbd1bb6. It is recommended to upgrade the affected component. The identifier VDB-222321 was assigned to this vulnerability.