CVE-2012-0007: Microsoft Anti-Cross Site Scripting Library

Medium severity, CVSS 4.3. EPSS: 18.6% chance of exploitation in the next 30 days.

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."

Affected products

• Microsoft Anti-Cross Site Scripting Library: version 3.1 only; version 4.0 only

Published 2012-01-10. Last modified 2026-06-16.