The LifterLMS WordPress plugin before 8.0.1 does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin.

The LifterLMS PayPal WordPress plugin before 1.4.0 does not sanitise and escape some parameters from the payment confirmation page before outputting them back in the page, leading to a Reflected Cross-Site Scripting issue

The LMS by LifterLMS – Online Course, Membership & Learning Management System Plugin for WordPress plugin before 4.21.2 was affected by an IDOR issue, allowing students to see other student answers and grades

The 'State' field of the Edit profile page of the LMS by LifterLMS – Online Course, Membership & Learning Management System Plugin for WordPress plugin before 4.21.1 is not properly sanitised when output in the About section of the profile page, leading to a stored Cross-Site Scripting issue. This could allow low privilege users (such as students) to elevate their privilege via an XSS attack when an admin will view their profile.

An issue was discovered in the LifterLMS plugin through 3.34.5 for WordPress. The uploadimport function in the class.llms.admin.import.php script is prone to an unauthenticated options import vulnerability that could lead to privilege escalation (administrator account creation), website redirection, and stored XSS.