QR Code Security and Phishing Prevention

QR Code Security

QR codes present unique security challenges because users cannot visually inspect the encoded content before scanning. This makes them a vector for phishing, malware distribution, and financial fraud.

Common Attack Vectors

Quishing (QR phishing) involves placing malicious QR codes over legitimate ones — a sticker on a parking meter redirecting to a fake payment site, for example. Attackers also distribute QR codes via email, printed flyers, and social media that link to credential-harvesting pages. Since shortened URLs hide the destination, users have no way to verify the link before scanning.

For Businesses Creating QR Codes

Always use your own domain rather than URL shorteners — users should see your brand in the URL preview. Register all variations of your domain to prevent typosquatting. Use HTTPS exclusively. Include your brand logo in the QR code to make unauthorized replacements more obvious. Monitor your QR code destinations with analytics to detect if a physical code has been replaced with a sticker.

For Users Scanning QR Codes

Modern smartphone cameras show a URL preview before opening — always read this preview. Look for suspicious domain names, HTTP (not HTTPS), or unfamiliar URL shorteners. If a QR code is on a sticker placed over another code, it's likely malicious. Never scan QR codes from unsolicited emails or messages. Be especially cautious with QR codes that request payment or login credentials.

Dynamic QR Code Security

Dynamic QR codes redirect through a service that can change the destination URL. While convenient for marketing, this means the QR code creator can change where it points at any time. Only use dynamic QR codes from trusted services, and prefer static codes for security-sensitive applications like payment links.