Cross-site scripting (XSS) vulnerability in login.php in EGroupware 1.4.001+.002; 1.6.001+.002 and possibly other versions before 1.6.003; and EPL 9.1 before 9.1.20100309 and 9.2 before 9.2.20100309; allows remote attackers to inject arbitrary web script or HTML via the lang parameter.
http://www.openwall.com/lists/oss-security/2010/09/21/7