Description The plugin does not sanitise and escape some parameters before outputting them back in the page, leading to Reflected Cross-Site Scripting which could be used against high privilege users such as admin
patchstack.com/database/vulnerability/archivist-custom-archive-templates/wordpress-archivist-custom-archive-templates-plugin-1-7-5-reflected-cross-site-scripting-xss-vulnerability
www.wordfence.com/threat-intel/vulnerabilities/wordpress-plugins/archivist-custom-archive-templates/archivist-custom-archive-templates-175-reflected-cross-site-scripting