Remember to log in as the admin user prior to RPM upgrade to perform DB upgrade.
.... Access bypass in private file fields on comments.
Drupal 7 contains two new features: the ability to attach File upload fields to any entity type in the system and the ability to point individual File upload fields to the private file directory.
If a Drupal site is using these features on comments, and the parent node is denied access (either by a node access module or by being unpublished), the file attached to the comment can still be downloaded by non-privileged users if they know or guess its direct URL.
This issue affects Drupal 7.x only.
Install the latest version:
The Security Team has released both a pure security update without other bug fixes and a security update combined with other bug fixes and improvements. You can choose to either only include the security update for an immediate fix (which might require less quality assurance and testing) or more fixes and improvements alongside the security fixes by choosing between Drupal 7.5 and Drupal 7.6. Read the announcement  for more information.
See also the Drupal core  project page.
Learn more about the Drupal Security team and their policies , writing secure code for Drupal , and securing your site .
 http://drupal.org/project/drupal  http://drupal.org/security-team/risk-levels  http://drupal.org/drupal-7.6  http://drupal.org/project/drupal  http://drupal.org/user/254778  http://drupal.org/user/52142  http://drupal.org/user/9446  http://drupal.org/contact  http://drupal.org/security-team  http://drupal.org/writing-secure-code  http://drupal.org/security/secure-configuration
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