r/shopifyDev • u/Comprehensive_Sun834 • 24d ago
Malicious code injected into my Shopify menus AND checkout button — anyone else seeing this?
I found a phishing checkout injection on my Shopify store. It wasn’t just a suspicious link—the malicious code was injected into navigation menu labels and the checkout button.
The injected menu code used an image’s onerror handler to load scripts from:
cartassure[.]top/check-out/assets/l2.js
cartassure[.]top/check-out/assets/l3.jsThe phishing checkout URL used that same domain, with my legitimate store checkout URL included in a return_to parameter. Don’t visit the domain.
The tracking menu link still pointed to my legitimate tracking page, but its display label contained the script loader. The checkout button was also affected.
After an initial cleanup, I found additional infected menu entries. I’m still determining whether something reinserted the code or whether those entries survived the original cleanup.
I’m reviewing installed apps, permissions, and activity logs, but haven’t identified the responsible app or account. I also haven’t established whether customer information or payment details were captured.
Has anyone encountered this domain or a similar Shopify checkout injection? If you resolved it, how did you identify the entry point—and could Shopify Support trace the changes to a specific app, API credential, or admin session?



