Acquia Drupal 1.2.54 (Drupal 6.29 core from Pressflow) contains the
following updates:

Note:
Due to vulnerabilities identified in previous versions of Drupal, Drupal
6.29 requires you to modify your .htaccess files to fully resolve a
vulnerability that allowed code to be executed on some existing Apache
installations. If you're upgrading to Acquia Drupal 1.2.54 from a previous
version of Drupal or Acquia Drupal and your hosting environment uses Apache,
use the full upgrade instructions at  www.acquia.com/acquia-drupal/upgrade

Resolved security alert

* SA-CORE-2013-003 - Drupal core - Multiple vulnerabilities (https://drupal.org/SA-CORE-2013-003)

Drupal core and module updates

* Updated Drupal core to 6.29 (http://drupal.org/drupal-6.29-release-notes)

* Updated Google Analytics to 6.x-3.6 (http://drupal.org/node/2114273)

* Updated Mollom to 6.x-2.6 (http://drupal.org/node/2132717)