The home improvement chain also said the malware responsible for the breach has been removed from all stores.
Costco, Dell, L.L. Bean and Overstock lead availability rankings for September.
Costco, Dell, L.L. Bean and Overstock tied for first place among large retailers in September availability tests, says Compuware Gomez. Last month, the four retailers each posted an Internet Explorer availability score of 99.96%. Overstock.com also led the way in Firefox testing with a 100% rating.
JCPenney.com and OfficeMax.com tied for fifth in Internet Explorer tests with a score of 99.95% availability.
Gap.com finished in second place for Firefox testing at 99.99% while Dell.com (99.96%) came in third, followed by Apple.com (99.95%) in fourth. JCPenney.com, Amazon.com, Williams-Sonoma.com and HSN.com tied for fifth, each posting 99.94% web site availability.
The average Internet Explorer availability for the 19 retailers measured in September was 99.83%, according to the Compuware Gomez Benchmarks study. The average Firefox availability for the same group of retailers last month was 99.82%.
Availability is determined by the percentage of tests that load correctly.