● Made For — E-Commerce

Your Checkout Page Is Your Castle. Attackers Are Already Inside the Walls.

A new class of attack doesn't need to break into your database. It just needs to watch over your customer's shoulder as they type.

You've built an online store your customers trust. They hand you the most sensitive thing in their financial life — their credit card number — every time they check out. But a new class of attack doesn't need to break into your database. It just needs to watch over your customer's shoulder as they type.

Every 16s

a new Magecart attack is estimated to occur worldwide

HUMAN Security

98.9%

of websites use JavaScript — giving attackers unlimited entry points

Cleverbridge Research

$230M

in GDPR fines British Airways faced following a single Magecart attack

Jscrambler / ICO

9 months

SelectBlinds had a live skimmer before it was discovered

TopClassActions, 2024

The Threat Hiding in Plain Sight

Meet Magecart — the umbrella name for criminal groups that specialize in injecting invisible JavaScript into e-commerce checkout pages to silently steal credit card data in real time. They don't need to break into your servers or steal your database. They just need one malicious script on your payment page — and then they wait.

The stolen data is used directly for fraud or sold on the dark web. And because the transaction completes normally from the customer's perspective, victims often don't realize anything happened until fraudulent charges appear days or weeks later.

“Magecart attacks only thrive because they aren't detected quickly. Some attacks have lasted 5 to 6 months, making it clear that companies have zero visibility of what code is being served to their users.”

— Jscrambler

Two Ways Attackers Come for Your Store

Skimmers on Your Checkout Page

Attackers compromise your site — often through a third-party plugin, outdated CMS, or supply chain vendor — and inject malicious JavaScript that pulls credit card data the moment a customer hits "Submit." The script often self-destructs when an admin logs in, making it nearly invisible during routine checks.

Hidden SEO Spam Links

Attackers also target popular e-commerce sites to quietly insert outbound links to their shady domains. Your domain authority is valuable. Links from a trusted store boost their search rankings. You become an unknowing accomplice — and your customers may be redirected toward phishing or fraud sites.

Attack Scenario

Your store uses a popular third-party product recommendation widget. The widget vendor gets compromised. An attacker injects one line of JavaScript into the widget's CDN script. Overnight, every store using that widget — including yours — starts silently forwarding checkout data to a server in Eastern Europe. Your firewall shows nothing. Your payment processor shows nothing. You find out from a Reddit post three months later.

A Documented Pattern of Attacks

Ticketmaster — 2018 (Supply Chain)

Attackers breached Inbenta, a third-party chatbot vendor used on Ticketmaster's payment page. 40,000 customers were compromised. The skimmer ran undetected for 5 months. Ticketmaster never got hacked directly — their vendor did.

British Airways — 2018 (Direct Injection)

Twenty-two lines of JavaScript redirected checkout data to an attacker-controlled domain. 380,000 customers exposed. The skimmer was live for 15 days. The fine originally proposed was £183 million — later reduced to £20M on appeal.

Newegg — 2018 (Direct Injection)

Attackers registered a lookalike domain — neweggstats.com — the day before activating the skimmer. Fifteen lines of JavaScript sent card data there for over a month. The domain was designed to be indistinguishable from Newegg's own infrastructure.

Volusion — 2019 (Supply Chain, 3,126 stores)

Attackers compromised a JavaScript library provided by Volusion to its e-commerce clients. In one move, they gained access to the checkout pages of over 3,000 online stores simultaneously.

SelectBlinds — 2024 (9 months undetected)

An unauthorized third party embedded malware directly on SelectBlinds' checkout page in January 2024. The company didn't discover it until September — nine months later. The skimmer scraped usernames, passwords, and payment data from every customer who logged in. Class action lawsuits followed.

Active Magecart Campaign — 2022–Present

A sprawling, ongoing campaign targeting merchants connected to American Express, Mastercard, Discover, Diners Club, JCB, and UnionPay. The campaign uses bulletproof hosting to resist takedowns and self-destructs when an admin session is detected.

How LinkSentry Protects You

Instant Visibility Into Every New Link

Every time a new external link or script source appears on your website — whether you added it or an attacker did — LinkSentry detects it. Skimmers pull their malicious code from attacker-controlled domains. The moment that link appears, you know about it.

Malicious Domain Detection

Continuously evaluates the reputation of every external domain your site connects to. If a script on your checkout page is phoning home to a known-bad or newly suspicious domain, you get an alert before your customers' data leaves your site.

SEO Spam Link Detection

Flags any new links that appear on your pages that you didn't authorize, catching both credit card skimmer infrastructure and SEO spam injection in one pass.

PCI DSS 4.0 Compliance Documentation

Requirements 6.4.3 and 11.6.1 now mandate that merchants monitor and inventory all scripts running on payment pages. LinkSentry gives you a continuous, auditable record of every external link and script — so you can demonstrate compliance, not just claim it.

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