How to fix server version on BigCommerce

Steps for BigCommerce

1. BigCommerce's SaaS infrastructure controls the 'Server' header — it is not configurable from the merchant admin.
2. For custom middleware or API-driven storefronts (Catalyst/Next.js), add header suppression in your 'next.config.js' (see code snippets below) and deploy via Vercel or your chosen host.
3. If using Cloudflare in front of BigCommerce, create a Cloudflare Transform Rule (Rules → Transform Rules → Modify Response Header) to delete 'X-Powered-By' and set 'Server' to a generic value.
4. Verify via DevTools that no technology version string is visible in response headers.

What is server version?

Every time a browser (or a bot) requests a page from your store, your web server sends back a set of "response headers" — invisible metadata about the response. Two of these headers, `Server` and `X-Powered-By`, often broadcast exactly what software is running your site and which version it is (for example, `Server: Vercel` or `X-Powered-By: Next.js`). This is called "server version disclosure" or "technology fingerprinting." While the header itself doesn't break anything, it acts like a name-badge that tells the whole internet: "Here's exactly what I'm running."

Attackers routinely scan millions of websites looking for servers running known vulnerable versions of software. When your headers announce your exact stack, you become a much easier target — automated exploit tools can match your version against public vulnerability databases (CVEs) and launch targeted attacks in seconds, without any human involvement. Suppressing these headers is a recognised security hardening step that reduces your "attack surface" and is increasingly expected by security audits, PCI-DSS assessments, and enterprise buyers reviewing your store. It also prevents competitors or scrapers from trivially identifying and copying your technology stack. Fixing it is usually a quick-win configuration change that has zero impact on site speed or user experience.

See the complete Server version guide for every platform and the full background.