The Real Cookie Banner WordPress plugin before 3.4.10 does not validate and escapes some of its shortcode attributes before outputting them back in the page, which could allow users with a role as low as a contributor to perform Stored Cross-Site Scripting attacks against logged-in admins.
https://wpscan.com/vulnerability/93c61a70-5624-4c4d-ac3a-c598aec4f8b6