The Ontario Cannabis Store (OCS) is informing customers that their data has been compromised through Canada Post.

President and CEO of OCS, Patrick Ford, sent out an email Wednesday morning revealing that about information from approximately 4,500 customers was accessed without permission through Canada Post’s delivery tracking tool.

Information including names, postal codes, delivery dates, and reference numbers were accessed, however Customer names, addresses, and payment information were not accessed.

“Since November 1, the OCS has worked closely with Canada Post to identify the cause of this issue and to prevent any further unauthorized access to customer delivery information,” said the notice sent by Ford.

“The OCS has encouraged Canada Post to take immediate action to notify their customers. To date, Canada Post has not taken action in this regard.”

Since the incident, Canada Post’s delivery tracking page has been down for maintenance.

OCS says that information from other Canada Post customers was likely compromised as well, though Canada Post has not publicly made any statements.