The WPeMatico RSS Feed Fetcher WordPress plugin before 2.6.12 does not escape the Feed URL added to a campaign before outputting it in an attribute, allowing high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed.
https://wpscan.com/vulnerability/eeedbb3b-ae10-4472-a1d3-f196f95b9d96