Some vulnerabilities have been reported in Drupal, which can be exploited by malicious people to conduct cross-site scripting attacks and bypass certain security restrictions, and by malicious users to conduct HTTP response splitting attacks.

1) Input passed to unspecified parameters is not properly sanitised before being returned to the user. This can be exploited to insert arbitrary HTTP headers, which is included in a response sent to the user. This allows arbitrary HTML and script code to be executed in a user's browser session in context of an affected site.

Successful exploitation of this vulnerability requires valid user credentials.

2) The Upload module includes the ".html" file extension in its default whitelist for file uploads. This can be exploited to upload arbitrary HTML files and enticing users to visit them, thereby executing arbitrary HTML and script code in a user's browser session in context of an affected site.

3) The hook_components API operation does not pass the publication status. This makes it possible for modules including Organic groups and Subscriptions to send e-mail messages containing unpublished comments.

The vulnerabilities are reported in the 4.7.x branch before 4.7.8 and in the 5.x branch before 5.3.

Solution
Update to version 4.7.8 or 5.3. Reconfigure the Upload module to disallow ".html" file uploads.

Provided and/or discovered by
Drupal security team

Changelog
Further details available to Secunia VIM customers

Original Advisory
1) http://drupal.org/node/184315
2) http://drupal.org/node/184320
3) http://drupal.org/node/184354

Deep Links
Links available to Secunia VIM customers