The WP Multi Store Locator WordPress plugin through 2.4 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks
https://wpscan.com/vulnerability/8281fce2-6f24-4d3f-895f-4d8694806609