As part of the cleanup from the Home Depot data breach, senior executives were issued "new, secure iPhones and MacBooks" after the breach was discovered to be the result of a Windows vulnerability. 9to5Mac reports on the specifics mentioned in a Wall Street Journal piece that breaks down the events leading to the largest retail breach on record (as of now).
Home Depot shores up security with Macs and iPhones after data breach
Similar to the breach at Target, Home Depot was hacked by someone who stole a password from a vendor, which provided access to a system that wasn't very well segregated from the rest of Home Depot's network, allowing the hacker to gain access to "more secure" Home Depot data, including not just 56 million credit card accounts, but a bonus 53 million email addresses.
Specifically this access was obtained using a vulnerability in Windows, which Microsoft promptly released a patch for. However, since hackers were already inside, it did no good. Self-checkout lanes were targeted, and the malware installed on those remained there for five months.
For more information about the timeline of the hack and how it was discovered, check out the Wall Street Journal article about the conclusions from Home Depot, security personnel, and law enforcement.