Google Chrome before 4.0.249.89 attempts to make direct connections to web sites when all configured proxy servers are unavailable, which allows remote HTTP servers to obtain potentially sensitive information about the identity of a client user via standard HTTP logging, as demonstrated by a proxy server that was configured for the purpose of anonymity.

browser/login/login_prompt.cc in Google Chrome before 4.0.249.89 populates an authentication dialog with credentials that were stored by Password Manager for a different web site, which allows user-assisted remote HTTP servers to obtain sensitive information via a URL that requires authentication, as demonstrated by a URL in the SRC attribute of an IMG element.

WebKit before r53607, as used in Google Chrome before 4.0.249.89, allows remote attackers to discover a redirect's target URL, for the session of a specific user of a web site, by placing the site's URL in the HREF attribute of a stylesheet LINK element, and then reading the document.styleSheets[0].href property value, related to an IFRAME element.