Windows 7: MS SharePoint bug exposes credentials, sensitive data.

Microsoft says it's investigating a security flaw in older versions of its SharePoint Server product that an independent researcher says can easily expose sensitive data and user authentication credentials.

The XSS, or cross-site scripting, vulnerability has been confirmed in SharePoint Server 2007 and is likely also present in earlier versions of the content management system software, an advisory from High-Tech Bridge warned. It allows adversaries to inject malicious javascript into the application by appending commands to the address of the targeted system.

"The vulnerability exists due to failure in the '/_layouts/help.aspx' script to properly sanitize user-supplied input in 'cid0' variable," the advisory states. "Successful exploitation of this vulnerability could result in a compromise of the application, theft of cookie-based authentication credentials, disclosure or modification of sensitive data."