Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in webjema WP-NOTCAPTCHA allows Reflected XSS. This issue affects WP-NOTCAPTCHA: from n/a through 1.3.1.

Authentication Bypass by Spoofing vulnerability in BestWebSoft Google Captcha allows Identity Spoofing. This issue affects Google Captcha: from n/a through 1.78.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in NotFound Customizable Captcha and Contact Us allows Reflected XSS. This issue affects Customizable Captcha and Contact Us: from n/a through 1.0.2.

Cross-Site Request Forgery (CSRF) vulnerability in Stanisław Skonieczny Secure CAPTCHA allows Stored XSS.This issue affects Secure CAPTCHA: from n/a through 1.2.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Alexey Trofimov Captchelfie – Captcha by Selfie allows Reflected XSS.This issue affects Captchelfie – Captcha by Selfie: from n/a through 1.0.7.

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 wppal Easy Captcha allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Easy Captcha: from n/a through 1.0.

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 Skt NURCaptcha plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 3.5.0. This is due to missing or incorrect nonce validation in the skt-nurc-admin.php file. This makes it possible for unauthenticated attackers to update settings and inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

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.