The YOP Poll plugin for WordPress is vulnerable to a race condition in all versions up to, and including, 6.5.26. This is due to improper restrictions on the add() function. This makes it possible for unauthenticated attackers to place multiple votes on a single poll even when the poll is set to one vote per person.

The YOP Poll WordPress plugin before 6.4.3 prioritizes getting a visitor's IP from certain HTTP headers over PHP's REMOTE_ADDR, which makes it possible to bypass IP-based limitations to vote in certain situations.

The YOP Poll WordPress plugin before 6.3.5 does not sanitise and escape some of the settings (available to users with a role as low as author) before outputting them, leading to a Stored Cross-Site Scripting issue

The YOP Poll WordPress plugin before 6.3.1 is affected by a stored Cross-Site Scripting vulnerability which exists in the Create Poll - Options module where a user with a role as low as author is allowed to execute arbitrary script code within the context of the application. This vulnerability is due to insufficient validation of custom label parameters - vote button label , results link label and back to vote caption label.

The YOP Poll WordPress plugin before 6.3.1 is affected by a stored Cross-Site Scripting vulnerability, which exists in the Admin preview module where a user with a role as low as author is allowed to execute arbitrary script code within the context of the application. This vulnerability is due to insufficient validation of question and answer text parameters in Create Poll module.

The YOP Poll WordPress plugin before 6.1.2 does not escape the perpage parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting

In the YOP Poll WordPress plugin before 6.2.8, when a pool is created with the options "Allow other answers", "Display other answers in the result list" and "Show results", it can lead to Stored Cross-Site Scripting issues as the 'Other' answer is not sanitised before being output in the page. The execution of the XSS payload depends on the 'Show results' option selected, which could be before or after sending the vote for example.

The yop-poll plugin before 6.0.3 for WordPress has wp-admin/admin.php?page=yop-polls&action=view-votes poll_id XSS.

Cross-site scripting vulnerability in YOP Poll versions prior to 5.8.1 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.