The Microsoft Anti-Cross Site Scripting (AntiXSS) Library 3.x and 4.0 does not properly evaluate characters after the detection of a Cascading Style Sheets (CSS) escaped character, which allows remote attackers to conduct cross-site scripting (XSS) attacks via HTML input, aka "AntiXSS Library Bypass Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14314
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-007
http://www.us-cert.gov/cas/techalerts/TA12-010A.html
http://www.securitytracker.com/id?1026499
http://www.securityfocus.com/bid/51291