Did you purchase ISBNs through Bowker’s website at myidentifiers.com between May and October 2018? Your credit card number might have been compromised. A few weeks ago (in October 2018) Bowker shut down the ordering system at myidentifiers.com for “extended maintenance” with no further information. No one could purchase ISBNs without either using one of their partner sites for a single ISBN or by FAX for a block of ten.
A few reports surfaced that people who had ordered ISBNs saw unauthorized charges made to their card after placing their order at myidentifiers.com. Shortly after it was confirmed on the MyIdentifier’s website that their checkout system had been comprised and they had taken it down while they investigated.
You can read their current notice at https://www.myidentifiers.com/important_information.
The website and ordering system are now back online and they state that they will attempt to reach out to anyone they think may have had their information exposed. It might be prudent to report it to your credit card company and get a new card issued if you purchased an ISBN in that time period. At a minimum, carefully monitor the credit card used on their website and report any suspicious activity to your credit card company immediately.
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