The NextGEN Gallery plugin before 2.1.10 for WordPress has multiple XSS issues involving thumbnail_width, thumbnail_height, thumbwidth, thumbheight, wmXpos, and wmYpos, and template.
https://www.openwall.com/lists/oss-security/2015/10/27/4
https://wordpress.org/plugins/nextgen-gallery/#developers
https://github.com/cybersecurityworks/Disclosed/issues/1
https://euvd.enisa.europa.eu/vulnerability/EUVD-2015-9377
https://cybersecurityworks.com/zerodays/cve-2015-9537-nextgen.html