The Coming Soon & Maintenance Mode Page plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.57. This is due to missing or incorrect nonce validation on the save_meta_box() function. This makes it possible for unauthenticated attackers to save meta boxes via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

The Coming Soon & Maintenance Mode Page plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.57. This is due to confusing logic functions missing or having incorrect nonce validation. This makes it possible for unauthenticated attackers to gain and perform otherwise unauthorized access and actions via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

The WordPress Coming Soon Page & Maintenance Mode plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the logo_width, logo_height, rcsp_logo_url, home_sec_link_txt, rcsp_headline and rcsp_description parameters in versions up to, and including, 1.8.1 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.

The Coming Soon Page & Maintenance Mode plugin for WordPress is vulnerable to unauthenticated settings reset in versions up to, and including 1.8.1 due to missing capability checks in the ~/functions/data-reset-post.php file which makes it possible for unauthenticated attackers to trigger a plugin settings reset.

Low privileged users can use the AJAX action 'cp_plugins_do_button_job_later_callback' in the WP Maintenance Mode & Site Under Construction WordPress plugin before 1.8.2, to install any plugin (including a specific version) from the WordPress repository, as well as activate arbitrary plugin from then blog, which helps attackers install vulnerable plugins and could lead to more critical vulnerabilities like RCE.

The SeedProd coming-soon plugin before 5.1.1 for WordPress allows XSS.