With 29% of site traffic having malicious intentions, protecting customer data and maintaining trust is increasingly critical for ecommerce operations. These fourteen best practices cover the security layers every online store should have, whichever platform you chose. If you are still deciding, our comparison of WooCommerce against Shopify covers where each leaves security to you in place.
An online shop is a bigger target than a brochure site because it holds three things worth stealing at once: card flows, customer records and an admin login that can quietly alter both. Most breaches are not sophisticated. They are an unpatched plugin, a reused administrator password, or a checkout page quietly serving a script nobody reviewed.
The fourteen practices below are ordered as layers rather than as a ranking. Each one closes a different route in, and the value comes from having them stacked, because any single control will eventually be bypassed.
How Ecommerce Sites Actually Get Breached
It helps to know what you are defending against before buying tools. Four patterns account for the overwhelming majority of incidents on small and mid-sized stores:
- Vulnerable extensions. A plugin or theme with a known flaw, left unpatched after the fix shipped. Attackers scan for the version string; the window between disclosure and exploitation is often measured in days.
- Credential stuffing. Passwords leaked from an unrelated breach, replayed against your login and customer account pages. It needs no vulnerability at all, only reuse.
- Checkout skimming. A few lines of JavaScript injected into the payment page, copying card details as they are typed and posting them elsewhere. The store keeps working perfectly, which is exactly why it goes unnoticed for months.
- Weak server hygiene. Out-of-date PHP, world-writable files, database credentials left in a backup that is reachable over the web.
Notice that only one of those is about your own code. The rest are about what you install, who can log in, and how the platform underneath is maintained.
14 Ecommerce Website Security Best Practices
1. Implement Multilayer Security
Multiple protective measures guard websites against different threats:
- Encryption to protect data
- Secure login systems to prevent unauthorised access
- Strong password policies requiring at least 8 characters with mixed case, numbers and special characters
- Multi-factor authentication (MFA) requiring two forms of verification
Layering matters more than the strength of any single measure. A password policy on its own is defeated by reuse; MFA on its own does not help if an old administrator account nobody remembers is still active. Audit your user list quarterly, remove accounts that have left, and give everyone the lowest role that lets them do their job. In WooCommerce that usually means Shop Manager rather than Administrator for day-to-day staff.
2. Use SSL Certificates
SSL certificates encrypt data between websites and customers. When installed, the website URL begins with “https” and displays a padlock icon in the browser’s address bar, building customer confidence and improving conversion rates.
One clarification worth making: the certificate is still called SSL by almost everyone, but the protocol doing the work is TLS, and only versions 1.2 and 1.3 are considered safe. Getting a certificate installed is the easy part. What is usually missed is enforcing it. Redirect every HTTP request to HTTPS, enable HSTS so browsers refuse to downgrade, and check that images, scripts and fonts all load over HTTPS too, because a single insecure asset on the checkout page will strip the padlock and the confidence that comes with it.
3. Guard Against Cross-site Scripting (XSS)
Hackers inject malicious code through user-generated content like forms or comments. Prevention strategies include:
- Sanitising user inputs
- Escaping data displayed on websites
- Regularly scanning for XSS vulnerabilities
XSS is the mechanism behind most checkout skimming, which is what makes it the highest-stakes item on this list for a shop. Escape on output rather than trying to clean on input, and use the functions your platform already provides instead of writing your own: in WordPress that is esc_html(), esc_attr() and wp_kses_post() depending on whether any markup is allowed through. A Content Security Policy adds a second layer by listing which domains may execute scripts at all, so an injected snippet pointing at an attacker-controlled server simply never runs.
4. Use Anti-malware Software
Anti-malware software scans for harmful programs and removes them. Regular updates and scheduled scans catch new threats, with many programs offering automatic updates.
Scanning is detection, not prevention, so what matters is how quickly it tells you. A weekly scan means a skimmer can run for six days. Look for file integrity monitoring that alerts on change rather than on a schedule, and make sure it covers the theme and plugin directories where injected code usually lands. Treat a positive result as a full incident: clean the files, then rotate every password and API key, because malware that could write to disk could almost certainly read your configuration.
5. Use a Firewall
Web application firewalls (WAF) protect against common attacks including:
- SQL injection
- Cross-site scripting (XSS)
- Cross-site request forgery (CSRF)
WAFs analyse incoming traffic in real time to detect malicious patterns.
A WAF earns its place on an ecommerce site for a second reason beyond blocking injection attempts: rate limiting. Login pages, password reset forms and coupon fields are all abused at volume, and a rule that throttles repeated attempts from one source stops credential stuffing and coupon brute-forcing without you writing any code. Run it at the edge if you can, so the traffic never reaches your server and never consumes the resources your real customers need.
6. Use a Payment Provider
Trusted payment providers like PayPal, Stripe or Square offer advanced security features:
- End-to-end encryption
- Fraud detection
- PCI-DSS compliance
- Tokenisation (replacing sensitive details with unique identifiers)
The decision that matters here is not which provider but how the card details reach them. If the fields live on your page and you post the numbers onward, you carry the full weight of PCI DSS. If you use the provider’s hosted fields or redirect the customer to their page, the card data never touches your server, your obligations drop to the shortest self-assessment questionnaire, and a compromise of your site cannot expose card numbers that were never there. It is the single biggest reduction in risk available to a small store.
7. Backup Your Website Data
Regular automated backups at intervals (daily, weekly or monthly) minimise downtime. Store backups in multiple locations such as cloud storage and external hard drives.
The useful rule is 3-2-1: three copies, on two kinds of media, one of them off-site. For a shop there is a wrinkle, which is that orders arrive continuously. A nightly backup can still mean losing a day of transactions, so check that your database is captured more often than your files, and that the retention window is longer than the time it typically takes to notice a problem. Thirty days is a sensible floor.
Above all, restore one. A backup nobody has tested is a hypothesis, not a safety net, and the moment you need it is the worst possible time to discover the archive was incomplete.
8. Comply with General Data Protection Regulation (GDPR) Guidelines
Key principles include:
- Data minimisation (collecting only necessary data)
- Data anonymisation (removing personally identifiable information)
- The right to be forgotten (users can request data deletion)
- Prompt breach notifications
- Secure data storage practices
Two GDPR obligations catch stores out in practice. The first is the 72-hour window: once you become aware of a breach involving personal data you have three days to notify your supervisory authority, which is impossible if nobody is monitoring for one. The second is that your processors are your responsibility. Your host, payment provider, email platform and analytics tools all handle customer data on your behalf, and you need a data processing agreement with each. Keep a list of them; it is the first thing asked for when something goes wrong.
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Talk To Sales →9. Regularly Update and Patch Computer Systems
Software developers frequently release security patches that fix vulnerabilities. Update website software, server OS, third-party plugins and themes, automating updates where possible.
Automate the updates that are safe to automate and stage the ones that are not. WordPress minor core releases are security-focused and rarely break anything, so they should apply themselves. Plugin and theme updates on a live store are a different matter, because a bad one can take checkout down and cost more than the vulnerability would have. Push those to a staging copy first, place a test order, then promote.
Do not overlook the layer below your site. PHP versions reach end of life and stop receiving security fixes entirely, and a store running on an unsupported version cannot be patched no matter how current the plugins are.
10. Set Up a VPN (Virtual Private Network)
A VPN encrypts internet traffic through a secure server, preventing hackers from monitoring online activities. It is essential for secure remote access to company resources and sensitive data.
Worth being precise about what this does and does not achieve. A VPN protects the connection between you and the network you are administering, which matters when staff log into the store from hotel or cafe Wi-Fi. It does nothing for your customers, and it is not a website security control. Treat it as one part of securing administrative access, alongside MFA and restricting the admin area by IP where your team works from fixed locations.
11. Input Validation and Sanitisation
These practices prevent malicious code injection such as SQL injection or XSS by:
- Validating user-submitted form data
- Removing JavaScript code and escaping special characters
- Cleaning input stripped of potentially harmful elements
For database work the rule is narrower and more absolute: never build a query by joining strings. Use parameterised queries so user input can never be read as SQL, which in WordPress means $wpdb->prepare() for anything that touches a variable. Validate against what you expect rather than against a list of things you fear, since a whitelist of permitted values ages far better than a blacklist of known-bad ones. Apply the same rigour to file uploads, which are a common route to remote code execution when a store accepts customer artwork or returns photos.
12. Code Reviews and Penetration Testing
- Regular code reviews identify weaknesses in application code
- Penetration testing simulates real-world cyberattacks to uncover vulnerabilities
Full penetration testing is out of reach for most small stores, and that is fine, because the cheaper practices catch more. Run automated dependency scanning so you learn about known vulnerabilities in what you have installed. Review any custom code that touches checkout, pricing or user accounts before it ships. If you do commission a test, do it after a significant change rather than annually by habit, and make sure someone owns the remediation list afterwards. An unactioned report is documentation of a problem, not a fix.
13. Collect Customer Data Ethically
- Obtain explicit consent before collecting personal information
- Clearly state what data is collected, how it is used and how long it is stored
- Avoid unnecessary data collection
- Ensure secure storage practices
There is a security argument for ethical collection, not only a legal one: data you never collected cannot be stolen. Ask whether you genuinely need a date of birth, a phone number or a full address for a digital product, and set a retention policy that deletes old order data rather than accumulating it forever. Smaller datasets are cheaper to protect, less damaging to lose, and simpler to hand over when a customer exercises their right to erasure.
14. Choose a Reliable Hosting Provider
A reliable hosting provider offers:
- Secure infrastructure
- Automatic backups
- SSL certificates
- DDoS protection
Hosting is where several of the items above are either handled for you or left as homework. The questions worth asking are specific: is there a firewall in front of the site by default, are backups automatic and restorable without a support ticket, how quickly are PHP versions updated, and does an isolated environment stop a compromise on one site reaching another? A host that answers those clearly removes most of this list from your plate.
Every FastCow plan includes a web application firewall, automated malware scanning, free certificates, daily off-site backups with 30-day retention and site isolation as standard, with engineers on hand 24/7 if something does go wrong.
If You Only Do Three Things
Fourteen items is a lot to act on at once. If the list is going to sit in a tab until next quarter, do these three and come back to the rest:
- Turn on multi-factor authentication for every administrator. It defeats credential stuffing outright, costs nothing, and takes an afternoon.
- Move card entry off your own page. Hosted fields or a redirect at checkout means a skimmer on your site has nothing to read, and it collapses your PCI scope at the same time.
- Get updates and backups on a schedule you do not have to remember. Automated patching plus a restore you have actually tested covers the two failure modes that cause the most lasting damage.
Everything else on this list is worth doing. These three are what stop the incidents that happen most often.