Architecture + Community + Security = Drupal
Drupal is based on the Presentation Abstraction Control architecture, or PAC. The menu system acts as the Controller. It accepts input via a single source (HTTP GET and POST), routes requests to the appropriate helper functions, pulls data out of the abstraction nodes or forms (nodes before Drupal 5), and then pushes it through a filter to get a Presentation of it (the theme system). It even has multiple, parallel PAC agents in the form of blocks that push data out to a common canvas (page.tpl.php)
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Drupal.org has a large community of users and developers, as of March 2015, over 1,167,000 user accounts and over 37,000 developer accounts. The semiannual Drupal conference alternates between North America and Europe. Attendance at Drupal Con grew from 500 at Szeged in August 2008 to over 3,700 people at Austin, Texas in June 2014.
Smaller events, known as “Drupal Camps” occur throughout the year all over the world. The annual Florida Drupal Camp brings users together coding for a cause for the benefit of nonprofit organizations.
There are a number of active Drupal forums, mailing lists and discussion groups. Drupal also maintains several IRC channels on the Freenode network.
There are over 30 national communities around drupal.org offering language-specific support.
Drupal’s policy is to announce the nature of each security vulnerability once the fix is released. Administrators of Drupal sites are automatically notified of these new releases via the Update Status module (Drupal 6) or via the Update Manager (Drupal 7). Drupal maintains a security announcement mailing list, a history of all security advisories, a security team home page, and an RSS feed with the most recent security advisories. In 2008, eleven security vulnerabilities were reported and fixed in the Drupal core. Security holes were also found and fixed in 64 of the 2243 user-contributed modules.
In 2014, Drupal issued a “highly critical” security advisory regarding an SQL injection bug in Drupal 7. One can download and installing an upgrade to Drupal 7.32 which will fix the vulnerability, but it does not remove any backdoor installed by hackers if the site has already been compromised. Attacks began soon after the vulnerability was announced. According to the Drupal security team, if a site had not been patched within hours of the announcement, it should be considered compromised and taken offline by being replaced with a static HTML page while the administrator of its server must be told that other sites on the same server may also have been compromised. To solve the problem, the site must be restored using backups from before October 15, be patched and manually updated, and anything merged from the site must be audited.