By Lisa Hage modified Jul 03, 2026
~ 5 minutes to read
Every 39 seconds, an automated bot probes a website somewhere on the internet, looking for a login form, an outdated plugin, or a form field it can abuse. Most of these attempts fail. A small percentage don't, and that small percentage is enough to put businesses out permanently. Roughly 60 percent of small businesses that suffer a serious cyberattack close within six months.
The global average cost of a data breach is around $4.44 million. In the US, it's $10.22 million, a record for the fifteenth year running. Third-party breaches, meaning attacks that come through a vendor, plugin, or script you didn't build, doubled from 15 percent to 30 percent of all incidents in a single year.
Website security isn't only about the code you write. It's about everything connected to your site that you didn't write, don't control, and often forget exists. This guide covers both sides: the practices every developer should follow and the external threat exposure that most businesses ignore or couldn’t foresee.
Website security is the practice of protecting a website, its data, and its visitors from unauthorised access, modification, or disruption. It spans 4 layers:
A useful way to think about it: website security isn't a single feature you install. It's a discipline that runs through every decision made during development, deployment, and maintenance. A site can have flawless code and still get breached through a misconfigured server. It can have a hardened server and still leak data through a careless input field.
Website security sits inside the broader field of cybersecurity, but it's narrower and more specific. Cybersecurity covers networks, devices, and entire organizations. Website security focuses on the public-facing asset that anyone with a browser can reach, which is exactly why it gets targeted so often.
Three shifts changed the risk calculation this year.
It's now present in 44 percent of breaches overall, and 88 percent of breaches at small and mid-sized businesses include a ransomware component, compared to 39 percent at large enterprises. Attackers have realised smaller sites have fewer defenses and less patience to negotiate.
Phishing lures written by AI see click-through rates roughly 54 percent higher than manually written ones, mostly because the grammar and spelling mistakes that used to give them away are gone. The same automation now scans thousands of sites an hour for known vulnerabilities in outdated plugins and libraries.
Breaches contained within 200 days cost $3.87 million on average. Push past 200 days and the number jumps to $5.01 million. Speed of detection, not just prevention, is now a direct line item in what a breach costs you.
None of this means small business sites are safe to ignore because they're "not a target." Attackers automate reconnaissance. They don't check your revenue before they scan your login page.
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This is the part most security checklists skip, and it's exactly why so many well-secured sites still get breached.
External website security refers to everything in your attack surface that lives outside your own codebase: subdomains you forgot about, third-party scripts loaded on your pages, plugins built by someone else, DNS records, expired SSL certificates, and vendor integrations that quietly have access to your systems.
Here's why this matters. You can write flawless, sanitised, injection-proof code and still get breached through a chat widget script, an analytics pixel, or an old staging subdomain nobody decommissioned. Attackers don't care whether the vulnerability is in your code or someone else's. They only care that it's connected to you.
Staging sites, old marketing microsites, and test environments frequently stay live and indexed long after a project ends. They rarely get the same patching schedule as production, which makes them easy entry points.
Chat tools, analytics trackers, ad pixels, and embedded fonts all run code on your pages with your site's trust. If one of those vendors gets compromised, the malicious code runs on your visitors' browsers as if it came from you.
A plugin author's account can be compromised without your site ever being directly targeted. The malicious update then ships straight to every site running that plugin, yours included.
An expired SSL certificate or a misconfigured DNS record can be hijacked to redirect traffic to a fake version of your site, harvesting logins before anyone notices.
Every third-party service with API access to your systems, from your CRM to your payment processor, extends your attack surface. A weak password on their end can expose your data on your end.
Start with an asset inventory. List every subdomain, plugin, script, and integration currently connected to your site. Most teams are surprised by how long this list gets. Anything unused gets decommissioned, not just disabled.
Audit third-party scripts quarterly. Remove anything you're not actively using, and use Subresource Integrity (SRI) tags on the ones you keep, so the browser rejects the script if its code changes unexpectedly.
Set calendar reminders for certificate renewals, or better, automate renewal through your hosting provider. An expired certificate is one of the most preventable failures in web security, and it still happens constantly.
Vet vendors before granting access, and review their access levels every few months. Least privilege applies to vendors just as much as it applies to employees.
This is also where working with a team that offers dedicated cybersecurity services pays off. Continuous external monitoring catches these gaps before an attacker does, not after.
Website security best practices are essential for protecting business websites from avoidable risks, data exposure, and trust-damaging incidents. A secure website not only reduces vulnerabilities but also builds confidence for customers, users, and stakeholders.
Weak passwords remain one of the single biggest entry points into a website. Require strong password policies, add multi-factor authentication on every account with elevated access, and hash passwords with a proven algorithm like bcrypt or Argon2, never store them in plain text. Give each user role only the access their job actually requires.
HTTPS encrypts data moving between the browser and the server. Without it, anything typed into a form on public Wi-Fi can be intercepted in plain text. Use a current TLS version, install a free certificate through Let's Encrypt if budget is a concern, and enable HSTS so browsers refuse to load your site over an insecure connection even if someone types the wrong URL.
SQL injection happens when an attacker slips malicious code into an input field that gets passed straight into a database query. Parameterised queries and prepared statements stop this by treating user input strictly as data, never as executable code. Modern ORMs handle most of this automatically, but never assume that means you're covered everywhere.
Every field on your site, not just obvious ones like login forms, is a potential entry point. Validate that input matches the expected type and length, and sanitise it to strip anything that could be interpreted as code. Do this on the server side. Client-side validation is a convenience for users, not a security control, since it's trivial to bypass.
XSS lets an attacker inject scripts that run in another user's browser, often to steal session cookies or hijack accounts. Encode output before it renders, apply a strict Content Security Policy, and lean on the built-in protections most modern frameworks already ship with.
Cookies carry a user's identity between requests. Set the HttpOnly flag so JavaScript can't read them, the Secure flag so they only travel over HTTPS, and SameSite rules to block cross-site request forgery. Never store passwords or sensitive data inside a cookie itself.
Outdated libraries are one of the most exploited weaknesses in web development, precisely because attackers already know what's wrong with them. Run npm audit or composer audit regularly, subscribe to security advisories for your core framework, and remove dependencies you no longer use instead of letting them sit dormant.
APIs are targeted constantly because they hand over structured access to your data. Require authentication on every endpoint, apply rate limits to block abuse and brute-force attempts, configure CORS rules precisely instead of allowing all origins, and never return more data in a response than the client actually needs.
A WAF filters malicious traffic before it reaches your application, catching common attack patterns like SQL injection and XSS attempts at the network edge. Pair it with security headers: a Content Security Policy to control what scripts can run, X-Content-Type-Options to stop MIME-sniffing attacks, and X-Frame-Options to prevent your site from being embedded in a malicious iframe. These headers take minutes to configure and close gaps that code-level fixes alone won't catch.
Detailed error messages are useful to developers and dangerous in the hands of an attacker. Show users a generic message and route the technical detail into secure server-side logs instead. Make sure those logs never capture passwords or personal data, and review them on a schedule, not just after something goes wrong.
Security isn't a task you complete once. Run code reviews on every significant change, schedule automated scans using SAST tools for your codebase and DAST tools against your live site, and benchmark your defenses against the OWASP Top 10, the industry's standard reference for the most critical web application risks. Larger sites benefit from periodic penetration testing or a bug bounty program to catch what internal reviews miss.
Backups are your recovery plan when every other defense fails. Automate daily backups, store them somewhere separate from your live server, and test restoring from one at least once a quarter, since an untested backup is just a hope. Pair this with a short, written incident response plan: who gets notified, who takes the site offline if needed, and who talks to customers. Having this written down before an incident cuts response time dramatically when it actually happens.
Find the Weak Spots Before Hackers Do
From outdated dependencies to forgotten staging sites, our cybersecurity services uncover the risks most businesses only discover after an attack.
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Some breaches announce themselves. Most don't. Watch for:
If any of these show up, isolate the site, restore from a clean backup, rotate every credential connected to it, and bring in a professional review before putting it back live. Guessing at the fix usually means the backdoor stays open.
Prevention is consistently cheaper than recovery, and the gap is widening. Detection and containment alone average $1.47 million per breach. Add lost business, which averages another $1.47 million, plus notification and post-breach response costs, and a mid-sized breach clears $4 million before legal fees or reputational damage even enter the picture.
Compare that to the cost of implementing the practices above: a WAF subscription, a few hours of developer time on headers and validation, and a properly configured backup routine. The math isn't close. Most businesses don't budget for security until after an incident forces the conversation. The businesses that budget for it beforehand are the ones still open a year later.
Retrofitting security onto an existing site is possible, but it's slower and more expensive than building it in from day one. If you're planning a new site or rebuilding an existing one, our web development and web application teams bake these practices into the build process itself, and our cybersecurity services team handles ongoing monitoring for the external threats most agencies never mention.
Small Websites Get Targeted Too
Automated attacks do not care about company size. Our cybersecurity services help protect business websites before vulnerabilities become expensive problems.
Protect My Business Site
Website security is the practice of protecting a website, its data, and its users from unauthorized access, modification, or disruption. It covers application code, server configuration, access policies, and client-side protections together, not any single one in isolation.
External website security refers to protecting the parts of your attack surface outside your own code: forgotten subdomains, third-party scripts, plugins, DNS records, certificates, and vendor integrations. It matters because attackers frequently breach well-coded sites through these outside connections rather than the code itself.
No. HTTPS protects data in transit between the browser and server, but it does nothing to stop SQL injection, XSS, weak passwords, or a vulnerable plugin. Treat it as one layer among many, not a complete solution.
Test during development, again before every major release, and on a recurring schedule after launch, typically monthly for automated scans and at least annually for a full penetration test if the site handles sensitive data.
Multi-factor authentication paired with regular, tested backups. Together they block the majority of account takeover attempts and guarantee a path back to normal if something still gets through.
Yes. Most attacks are automated and scan for known vulnerabilities regardless of a site's size or traffic. Small businesses are targeted in roughly half of all cyberattacks, and 60 percent that suffer a serious breach close within six months.
Lisa Hage is an experienced content writer specializing in SEO-friendly blogs, website copy, and engaging marketing content. With a keen eye for detail and a passion for storytelling, she creates compelling content that drives results. She also provides high-quality custom content—contact us via email for more information.
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