JEX-Treme Einfacher Passwortschutz "msg" Cross-Site-Scripting

hackberry has discovered a vulnerability in Einfacher Passwortschutz, which can be exploited by malicious people to conduct cross-site scripting attacks.

Input passed to the "msg" parameter in index.php is not properly sanitised before being returned to a user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

The vulnerability is confirmed in a version downloaded on 2007-04-19. Other versions may also be affected.