# Exploit Title: WordPress Plugin LifterLMS 4.21.0 - Stored Cross-Site Scripting (XSS) # Date: 2021-05-10# Exploit Author: Captain_hook# Vendor Homepage: https://lifterlms.com/# Software Link: https://github.com/gocodebox/lifterlms/releases/tag/4.21.0# Version: LifterLMS < 4.21.1# Tested on: ANY# CVE : CVE-2021-24308#Summary:
The 'State' field of the Edit profile page of the LMS by LifterLMS – Online Course, Membership & Learning Management System Plugin for WordPress plugin before 4.21.1isnot 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.#Proof_of_Concept:1- As a Lowest Privilege user go to the edit account page of the LMS
(e.g https://example.com/my-courses/edit-account/)2- Put Your XSS payload in State parameter and save your edits, such
as "><script>alert(/XSS/)</script>3- The XSS will be stored and triggered in the about section of the profile:(e.ghttps://example.com/directory/[user_name]/)(Note): The XSS will also be triggered in the admin dashboard when viewing the user details,for example https://example.com/wp-admin/admin.php?page=llms-reporting&tab=students&stab=information&student_id=2
Refernces:
https://github.com/gocodebox/lifterlms/releases/tag/4.21.0
