Computer security researchers have devised a new Twitter attack that they say could spread virally, much like a worm on the microblogging service. The attack is an innocuous proof-of-concept that forces users to send out a predetermined Twitter message, but it could be repurposed into a very nasty worm. You can couple an attack with our code and it would just tear the crap out of Twitter, said chief scientist Lance James, chief scientist at Secure Science,.
Source: https://threatpost.com/twitter-vulnerable-xss-worm-attack-032009/72389/