Winamp before 5.0.4 allows remote attackers to execute arbitrary script in the Local computer zone via script in HTML files that are referenced from XML files contained in a .wsz skin file.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17124
https://euvd.enisa.europa.eu/vulnerability/EUVD-2004-0818
http://www.frsirt.com/exploits/08252004.skinhead.php