The Facebook Chat Plugin for WordPress is vulnerable to authorization bypass due to a missing capability check on the wp_ajax_update_options function in versions up to, and including, 1.5. This flaw makes it possible for low-level authenticated attackers to connect their own Facebook Messenger account to any site running the vulnerable plugin and engage in chats with site visitors on affected sites.

The RumbleTalk Live Group Chat – HTML5 plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'rumbletalk-admin-button' shortcode in all versions up to, and including, 6.3.0 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The Pure Chat – Live Chat Plugin & More! plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the purechatwid and purechatwname parameter in all versions up to, and including, 2.22 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber access or above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The Live Chat with Facebook Messenger plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'messenger' shortcode in all versions up to, and including, 1.0 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Auth. (admin+) Stored Cross-Site Scripting (XSS) vulnerability in Formilla Live Chat by Formilla plugin <= 1.3 versions.

The Steveas WP Live Chat Shoutbox WordPress plugin through 1.4.2 does not sanitise and escape a parameter before using it in a SQL statement via an AJAX action available to unauthenticated users, leading to a SQL injection.

The Steveas WP Live Chat Shoutbox WordPress plugin through 1.4.2 does not sanitise and escape a parameter before outputting it back in the Shoutbox, leading to Stored Cross-Site Scripting which could be used against high privilege users such as admins.

The Retain Live Chat WordPress plugin through 0.1 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 unfiltered_html capability is disallowed (for example in multisite setup)

The Free Live Chat Support plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including 1.0.11. This is due to missing nonce protection on the livesupporti_settings() function found in the ~/livesupporti.php file. This makes it possible for unauthenticated attackers to inject malicious web scripts into the page, granted they can trick a site's administrator into performing an action such as clicking on a link.

Cross-site Scripting (XSS) in GitHub repository livehelperchat/livehelperchat prior to 3.99v. The attacker can execute malicious JavaScript on the application.