The CMP – Coming Soon & Maintenance WordPress plugin before 4.1.20 does not correctly restrict access to the site while maintenance/coming-soon mode is enabled, allowing unauthenticated visitors to bypass the coming-soon page and reach the otherwise hidden site, including hidden published pages, by shaping the request so it is mistaken for a login request.

The CMP – Coming Soon & Maintenance Plugin by NiteoThemes plugin for WordPress is vulnerable to unauthorized modification of data that can lead to privilege escalation due to a missing capability check on the 'cmpajaximportsettings' AJAX action in all versions up to, and including, 4.1.17. This makes it possible for authenticated attackers, with Editor-level access and above, to update arbitrary options on the WordPress site. This can be leveraged to update the default role for registration to administrator and enable user registration for attackers to gain administrative user access to a vulnerable site.

The CMP – Coming Soon & Maintenance Plugin by NiteoThemes plugin for WordPress is vulnerable to arbitrary file upload and remote code execution in all versions up to, and including, 4.1.16 via the cmpthemeupdateinstall AJAX action. This is due to the function only checking for the publishpages capability (available to Editors and above) instead of manageoptions (Administrators only), combined with a lack of proper validation on the user-supplied file URL and no verification of the downloaded file's content before extraction. This makes it possible for authenticated attackers, with Administrator-level access and above, to force the server to download and extract a malicious ZIP file from a remote attacker-controlled URL into a web-accessible directory (wp-content/plugins/cmp-premium-themes/), resulting in remote code execution. Due to the lack of a nonce for Editors, they are unable to exploit this vulnerability.

Server-Side Request Forgery (SSRF) vulnerability in NiteoThemes CMP – Coming Soon & Maintenance.This issue affects CMP – Coming Soon & Maintenance: from n/a through 4.1.10.

Unrestricted Upload of File with Dangerous Type vulnerability in NiteoThemes CMP – Coming Soon & Maintenance cmp-coming-soon-maintenance allows Using Malicious Files.This issue affects CMP – Coming Soon & Maintenance: from n/a through <= 4.1.14.

The CMP – Coming Soon & Maintenance plugin for WordPress is vulnerable to Maintenance Mode Bypass in versions up to, and including, 4.1.7. A correct cmpbypass GET parameter in the URL (equal to the md5-hashed homeurl in the default setting) allows users to visit a site placed in maintenance mode thus bypassing the plugin's provided feature.

The CMP – Coming Soon & Maintenance plugin for WordPress is vulnerable to Information Exposure in versions up to, and including, 4.1.6 via the cmpgetpostdetail function. This can allow unauthenticated individuals to obtain the contents of any non-password-protected, published post or page even when maintenance mode is enabled.

The CMP for WordPress is vulnerable to authorization bypass due to a missing capability check on the cmpgetpostdetail(), niteoexportcsv(), and cmpdisablecomingsoonajax() functions in versions up to, and including, 3.8.1. This makes it possible for unauthenticated attackers to read posts, export subscriber lists, and/or deactivate the plugin.

The CMP WordPress plugin before 4.0.19 allows any user, even not logged in, to arbitrarily change the coming soon page layout.