The Advanced Google reCAPTCHA plugin for WordPress is vulnerable to IP unblocking in all versions up to, and including, 1.25. This is due to the plugin not utilizing a strong unique key when generating an unblock request. This makes it possible for unauthenticated attackers to unblock their IP after being locked out due to too many bad password attempts

Missing Authorization vulnerability in Bill Minozzi reCAPTCHA for all allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects reCAPTCHA for all: from n/a through 1.22.

The ReCaptcha Integration for WordPress 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, 1.2.5. 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.

The Freemius SDK, as used by hundreds of WordPress plugin and theme developers, was vulnerable to Cross-Site Request Forgery and Information disclosure due to missing capability checks and nonce protection on the _get_debug_log, _get_db_option, and the _set_db_option functions in versions up to, and including 2.4.2. Any WordPress plugin or theme running a version of Freemius less than 2.4.3 is vulnerable.

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in weDevs ReCaptcha Integration for WordPress allows Stored XSS.This issue affects ReCaptcha Integration for WordPress: from n/a through 1.2.5.

The reCAPTCHA Jetpack WordPress plugin through 0.2.2 does not have CSRF check in some places, and is missing sanitisation as well as escaping, which could allow attackers to make logged-in admin add Stored XSS payloads via a CSRF attack.

The reCAPTCHA Jetpack WordPress plugin through 0.2.2 does not have CSRF check in place when updating its settings, which could allow attackers to make a logged in admin change them via a CSRF attack

Cross-Site Request Forgery (CSRF) vulnerability in Vsourz Digital CF7 Invisible reCAPTCHA plugin <= 1.3.3 versions.

The reCAPTCHA WordPress plugin through 1.6 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 Login No Captcha reCAPTCHA WordPress plugin before 1.7 doesn't check the proper IP address allowing attackers to spoof IP addresses on the allow list and bypass the need for captcha on the login screen.