The Login Logout Menu WordPress plugin before 1.4.0 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.
https://wpscan.com/vulnerability/cd6657d5-810c-4d0c-8bbf-1f8d4a2d8d15