Cross-site scripting (XSS) vulnerability in the convert_highlite_words function in Invision Blog before 1.1.2 Final allows remote attackers to inject arbitrary web script or HTML via double hex encoded highlight data.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-1947
http://www.gulftech.org/?node=research&article_id=00078-06072005