Steam Christmas Issues Explained

Steam News has an official statement on the problems on Steam on Christmas, explaining why some users were able to see details from other accounts. They explain the incidents stemmed from issues with a caching solution that was implemented to combat a denial of service attack, and offer the following outline of exactly what happened:
On December 25th, a configuration error resulted in some users seeing Steam Store pages generated for other users. Between 11:50 PST and 13:20 PST store page requests for about 34k users, which contained sensitive personal information, may have been returned and seen by other users.

The content of these requests varied by page, but some pages included a Steam user’s billing address, the last four digits of their Steam Guard phone number, their purchase history, the last two digits of their credit card number, and/or their email address. These cached requests did not include full credit card numbers, user passwords, or enough data to allow logging in as or completing a transaction as another user.

If you did not browse a Steam Store page with your personal information (such as your account page or a checkout page) in this time frame, that information could not have been shown to another user.

Valve is currently working with our web caching partner to identify users whose information was served to other users, and will be contacting those affected once they have been identified. As no unauthorized actions were allowed on accounts beyond the viewing of cached page information, no additional action is required by users.
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Dec 31, 2015, 10:43
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Steam comms Dec 31, 2015, 10:43
Dec 31, 2015, 10:43
 
Steam's communications team sucks. Typical Valve in that regard. For a company that's as well-regarded as they are ... all the good press is because they butter us up with sales. Their support blows.

TB calls them out on this and I found his comments were on point. We've been giving Valve a pass on almost everything and ... sure, I love a Steam Sale, but they need better support, communications, accountability. No other major retailer would get so much glad-handing as Valve does.
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