Medium · published February 13, 2023
CVSS calls it medium at 6.1. It sits in the 99.3th percentile for exploit probability.
The Paid Memberships Pro WordPress plugin before 2.9.9 does not validate and escape some of its shortcode attributes before outputting them back in the page, which could allow users with a role as low as contributor to perform Stored Cross-Site Scripting attacks which could be used against high privilege users such as admins.