Update: It appears the Steam Store is back online and the issue appears to be resolved. We have yet to hear from Valve in an official capacity, and will update the blog post when we do.

This was not a hack or a DDoS attack. This was highly likely to be a misconfiguration in one of Valve’s caching layers.

If you used a PayPal account and had the details saved, you can unlink your account by logging on PayPal.com and going to Settings and Preapproved payments under the Payment options heading.

Going forward, we strongly encourage you not to store your billing information on the Steam store. Valve have proven multiple times that they’re unable to keep their security standards to a high level.
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更新了，STEAMDB说了这不是黑客攻击的问题，是SBEAM自己服务器配置错误，而且强烈推荐不要把自己的个人支付信息和渠道绑定在SBEAM上（比如信用卡和paypal），换言之银联这种三方结算反而还安全些……

引用:

原帖由 3036273 于 2015-12-26 09:01 发表
posted by wap, platform: iPhone
我的信用卡信息岂不药丸

你只要在刚才那几个小时大姨妈的时段内没登陆SBEAM（任何形式，包括客户端和网页）就没有泄露风险

引用:

原帖由 最后的守护者 于 2015-12-26 09:53 发表
posted by wap, platform: Firefox
如果那么严重的话为什么不干脆关闭服务器禁止登陆？

因为这个是配置时候出的错，估计在进行全球同步，关闭的话也许可能有影响，而且关闭了不是又承认自己傻逼了么……公司越大越不可能主动示弱