Online comic and game retailer OneBookShelf announced last month that it was the victim of a data breach, compromising customer information. 

"A hacker found a crack in our defenses and got in," the company said on an informational page on its website following the hack. 

According to the page, one of its two credit card processing servers was compromised and used not only to steal the customer information passing through, but also to launch attacks on other websites. Any orders processed from July 10 through Aug 6 are at risk.

The fact that only one of the servers was breached, the company is not sure how many cards were compromised, but, in an email sent from affiliate site DriveThruRPG.com to customers, it said that "there is a 50 percent chance that hackers were able to collect your credit card information."

OneBookShelf owns and runs many other websites, all of which suffered in the hack. In addition to DriveThruRPG.com, it owns DriveThruComics.com, RPGnow.com, DNDClassics.com, DriveThruCards.com, DriveThruFiction.com, Ulisses-ebooks.de and WargameVault.com.

Since shutting down the attack last month, the company secured its systems and sealed the gap through which its servers were hacked.

"Security has always been our top concern and up until this incident we were proud of our security record," the company said in an email to customers.  "We will continue to do everything we can to keep our marketplace secure going forward."

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