Recently, a severe SQL Injection vulnerability was found in Drupal 7. It was fixed immediately (and correctly), but there was a problem. Attackers made automated scripts to attack unpatched sites. Within hours of the release of the vulnerability fix, sites were being compromised. And when I say compromised, I’m talking remote code execution, backdoors, the lot. Why? Like any attack, it’s a chain of issues, that independently aren’t as bad, but add up to bad news. Let’s talk about them: What went wrong? What went right? And what could have happened better? There’s a lesson that every developer needs to learn in here.