The Simple Posts Ticker WordPress plugin before 1.1.6 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/c34f8dcc-3be6-44ad-91a4-7c3a0ce2f9d7