XSS security vulnerabilities in many plugins and core!
Looks like the guy who discovered the Poll plugin exploit found a whole lot more than that. Did he post them here? This seems fairly urgent, now that they are published.
One of them even describes a somewhat convoluted XSS exploit to the core Tagging plugin: http://www.exploit-db.com/exploits/18980/
I would only assume there are more exploits among the other addons as well...