QR code is a secure technology, and after creating vCard QR codes, they do not pose any inherent risk. However, it's important to note that any person scanning the vCard will have access to the personal information in the vCard. Therefore, when preparing a vCard QR code, attention should be paid to the personal information included. For example, adding a home address to a vCard could potentially be risky because if the QR code falls into the hands of malicious individuals who then learn your home address or similarly sensitive personal information, it could lead to problems.