Vignette StoryServer 4 and 5, and Vignette V/5 and V/6, with the SSI EXEC feature enabled, allows remote attackers to execute arbitrary code via a text variable to a Vignette Application that is later displayed.
http://www.securityfocus.com/bid/7685
http://www.s21sec.com/es/avisos/s21sec-016-en.txt