The WP Maps – Store Locator,Google Maps,OpenStreetMap,Mapbox,Listing,Directory & Filters plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'put_wpgm' shortcode in all versions up to, and including, 4.8.7. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes. This makes it possible for authenticated attackers, with contributor level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.