Auth. (admin+) Stored Cross-Site Scripting (XSS) vulnerability in WebCource WC Captcha plugin <= 1.4 versions.

Cross-Site Request Forgery (CSRF) vulnerability in Nitin Rathod WP Forms Puzzle Captcha plugin <= 4.1 versions.

Cross-Site Request Forgery (CSRF) vulnerability in Devnath verma WP Captcha plugin <= 2.0.0 versions.

An issue was discovered in the hcaptcha (aka hCaptcha for EXT:form) extension before 2.1.2 for TYPO3. It fails to check that the required captcha field is submitted in the form data. allowing a remote user to bypass the CAPTCHA check.

Auth. (admin+) Stored Cross-Site Scripting (XSS) vulnerability in Benjamin Guy Captcha Them All plugin <= 1.3.3 versions.

Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in wppal Easy Captcha plugin <= 1.0 versions.

The Flexible Captcha WordPress plugin through 4.1 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks

A vulnerability classified as problematic was found in jianlinwei cool-php-captcha up to 0.2. This vulnerability affects unknown code of the file example-form.php. The manipulation of the argument captcha with the input %3Cscript%3Ealert(1)%3C/script%3E leads to cross site scripting. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 0.3 is able to address this issue. The name of the patch is c84fb6b153bebaf228feee0cbf50728d27ae3f80. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-218296.

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.