Quote:R.R. Bowker's myidentifiers.com ISBN Agency affiliate platform was breached, with the checkout page being modified to exfiltrate credit card information, as initially discovered by Publisher Weekly.

ISBNs are distinct and numeric-based commercial book identifiers used to by publishers to register new publications and their variations, and they can be purchased from International ISBN Agency affiliates such as R.R. Bowker. The issue was discovered when the payment card networks used for making purchases on their ISBN platform alerted the company of a number of unauthorized charges – probably reported by users – initiated with credit cards that were used to buy identifiers on myidentifiers.com.

"We immediately launched an investigation and engaged a leading forensic firm to assist," says the R.R. Bowker security breach announcement. "Our investigation has identified unauthorized code that was added to the checkout page on our website."