A data breach affected nearly 1 million individuals when a supplier to Canada Post fell victim to a malware attack last week. These individuals were customers of 44 businesses served by the postal agency.

The supplier, Commport Communication – an electronic data interchange solution supplier, has been used by the postal agency to manage the shipping manifest data of large business customers.

Canada Post made the announcement on Wednesday after conducting a detailed forensic investigation – claiming that no financial information was compromised following the attack.

The postal service added they have proactively informed impacted business customers and have provided them with the information and support to help them “determine next steps.”

The Office of the Privacy Commissioner has also been notified, Canada Post added.