Back in the early days of the web, there were plenty of stories about a rather simple security breach on various sites. Basically, many sites would simply pass a user's account number through as a part of the URL. If a user simply changed the URL, her or she could see the account info of that other issue associated with the new number. After a few such cases came to light, most web app designers quickly realized to plug that hole, and it's been quite some time since we've heard of a site with such a security hole. However, it appears that there are still a few. The site for Passport Canada, where people can apply for a Canadian passport apparently had exactly that security vulnerability
, allowing the guy who discovered it to see the passport application data of other applicants simply by adjusting the URL. It's never nice to hear about a security flaw (especially on a gov't website with all sorts of private info), but it actually induces a bit of nostalgia to hear of such a basic security flaw showing up in the wild yet again.