Secure your checkout before peak season

Magecart skimming starts with XSS

The majority of Magecart card-skimming attacks begin with a stored XSS vulnerability that injects a script into the checkout page. Penetrify finds XSS, including stored XSS in product reviews, user profiles, and CMS fields, before attackers weaponize it.

Checkout logic bugs cause direct revenue loss

Price manipulation, coupon abuse, and cart total overrides are business logic vulnerabilities that DAST scanners don't test for. Penetrify's AI understands application flows: it tests whether your pricing logic can be bypassed, not just whether your server has a known CVE.

PCI DSS doesn't care that it was a plugin

If a third-party plugin introduced the vulnerability that led to card data exposure, you still face the PCI DSS investigation. Regular penetration testing, not just quarterly network scans, is required, and responsibility is yours regardless of the code's origin.

Requirement 11.4.1: documented pentest methodology; testing at least every 12 months and after significant changes to the cardholder data environment

Requirements 6.4.3 & 11.6.1: payment page script inventory/authorization and tamper detection, mandatory since 31 March 2025

Article 32: Regular testing of technical measures protecting personal data

CC6.1: Logical access controls with penetration testing evidence

PCI DSS 4.0 Went After Magecart: Requirements 6.4.3 and 11.6.1

Since 31 March 2025, two formerly future-dated PCI DSS 4.0 requirements are mandatory, and both exist because of e-skimming. Requirement 6.4.3 demands that every script loaded on your payment pages is inventoried, authorized, and integrity-checked, including third-party tags you did not write. Requirement 11.6.1 demands a change- and tamper-detection mechanism that alerts on unauthorized modification of payment page scripts and security-relevant HTTP headers as the consumer browser receives them.

These are anti-Magecart controls: they assume the attacker will get a script into your checkout and make sure you notice. Penetration testing attacks the step before that: the stored XSS in a review field, the vulnerable admin panel, or the injectable CMS block that gives the attacker script execution in the first place. A checkout that cannot be injected is the control that makes 6.4.3 and 11.6.1 alarms stay quiet.

If you accept payments through an iframe or hosted payment page, read the requirements carefully anyway: SAQ A merchants are not exempt from the script-management logic on the page that embeds the iframe, and your acquirer will ask.

Checkout Logic: The Vulnerabilities That Do Not Have a CVE

The highest-value e-commerce vulnerabilities are business logic, not missing patches: cart totals recalculated client-side and trusted server-side, coupon codes that stack because each code path validates independently, race conditions that let a gift card balance be spent twice, and order APIs that leak other customers' addresses through sequential IDs. None of these appear in a CVE database, so scanner-based tools structurally cannot find them.

Penetrify's AI agent tests the flows the way a fraudster works them: manipulating prices and quantities at every step between cart and capture, replaying and racing requests, probing coupon and loyalty logic, and walking order IDs across accounts. Before every peak season, that is the test your checkout actually needs.

Penetrify systematically tests every user-controlled input field (product reviews, profile fields, CMS content, address forms) for stored and reflected XSS. Finding XSS before it reaches your checkout is the difference between a fixed bug and a breach notification.

Price manipulation, coupon logic bypasses, and cart total overrides are business logic vulnerabilities invisible to header-checking scanners. Penetrify's AI tests whether your checkout flows enforce pricing rules consistently across all code paths.

Penetrify produces structured penetration test reports with severity ratings and remediation guidance. You go into your QSA assessment with documented evidence of ongoing security testing, not scrambling to schedule a last-minute engagement.

Peak season is the worst time to discover a vulnerability. Run a full penetration test in staging six weeks before your traffic spike, and again after every significant release. At $1,700/month for 20 scans, security testing fits the e-commerce calendar.