osCommerce recommended a few months ago that osCommerce users update to the latest version, osCommerce 2.2 Milestone 2 051112 Update. The update "addresses security related issues and bug reports that exist in the released version". The changes are minimal and are not expected to break compatibility with contributions (third-party plugins). Additional information:
This update release focuses solely on security related issues and bug reports, and does not introduce any new features that have been made for the next development milestone release.