The Everest Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.4.3 via deserialization of untrusted input from form entry metadata. This is due to the html-admin-page-entries-view.php file calling PHP's native unserialize() on stored entry meta values without passing the allowedclasses parameter. This makes it possible for unauthenticated attackers to inject a serialized PHP object payload through any public Everest Forms form field. The payload survives sanitizetextfield() sanitization (serialization control characters are not stripped) and is stored in the wpevfentrymeta database table. When an administrator views entries or views an individual entry, the unsafe unserialize() call processes the stored data without class restrictions.
The Everest Forms WordPress plugin before 3.0.3.1 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfilteredhtml capability is disallowed (for example in multisite setup).
The Everest Forms WordPress plugin before 3.0.8.1 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfilteredhtml capability is disallowed (for example in multisite setup).
The Everest Forms WordPress plugin before 3.0.4.2 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfilteredhtml capability is disallowed (for example in multisite setup).
The Contact Form, Drag and Drop Form Builder for WordPress plugin before 1.8.0 does not escape the status parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting issue
A SQL injection vulnerability exists in WPEverest Everest Forms plugin for WordPress through 1.4.9. Successful exploitation of this vulnerability would allow a remote attacker to execute arbitrary SQL commands on the affected system via includes/evf-entry-functions.php