How Do You Block Scripts From Reading Card Fields?

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To block malicious scripts from reading card fields, keep card entry in your provider's iframe, limit what each vendor may do, and block the scripts you don't trust, in the browser. A CSP helps, but can't see an allowed script reading the field. Script Monitoring is one tag that watches every script on your payment pages, in every session, and shows what needs you today. Why is this possible? JavaScript on a page can read every input on that page. The browser has no idea that one script may touch the card field and another may not. Your analytics vendor's vendor can read it as easily as you can. A payment iframe helps, because browsers stop your page's scripts reading inside a cross-origin frame. But the page around it is yours. A script there can draw a fake form over the iframe, or capture keystrokes before the iframe gets them. Formjacking comes in two forms. A script listens to your real card inputs, or it swaps your form for an identical one it controls and passes the data through, so the purchase still completes. Both are spotted by watching which script reads the fields. Keep your Content Security Policy. It decides where scripts may come from, but it can't tell you an allowed script is reading the card field. Block rules and limits decide which scripts are stopped, and what an allowed vendor may do. On Pro, vendor guardrails limit a tag you need. Kitebird, a marketing script, gets Can't read card details, enforced in the browser. Block a script you don't trust by URL, host or domain, on every page, with no deploy. Or start in monitor-only: see what would be blocked, and nothing stops until you say so. Block rules and monitor-only mode are on every plan, Free too, at 1,000 page views a month. Vendor guardrails are on Pro, from $99 a month, with a 14-day trial. Start for free at scriptmonitoring.com.