How to fix missing x frame options on Webflow
Add the X-Frame-Options HTTP response header set to DENY or SAMEORIGIN to prevent your store's pages from being embedded in iframes on other sites.
Steps for Webflow
- Webflow does not currently support setting arbitrary custom HTTP response headers from the Designer or project settings for standard hosted plans.
- For Webflow Enterprise: contact your Webflow account manager — Enterprise plans may support custom header configuration.
- For all Webflow plans: proxy your domain through Cloudflare → Rules → Transform Rules → Response Header Modification → Set X-Frame-Options = SAMEORIGIN → Save & Deploy.
- If you export your Webflow site and host it yourself (e.g., on Netlify or Vercel), add the header in netlify.toml or vercel.json — see the Headless / Custom entry.
- Verify with browser DevTools or securityheaders.com after the CDN rule or hosting config is live.
What is missing x frame options?
The X-Frame-Options header is a security instruction your web server sends to browsers telling them whether your pages are allowed to be loaded inside an iframe (an invisible "frame" embedded in another website). When this header is missing, any website in the world can silently embed your store inside their page. The two safe values are DENY (no framing at all) and SAMEORIGIN (only your own domain can frame your pages). Most stores should use SAMEORIGIN unless you have no legitimate need to embed your own pages in iframes, in which case DENY is even stronger.
Without X-Frame-Options, attackers can use a technique called "clickjacking" — they overlay your store's checkout or login page inside an invisible iframe on a malicious site, tricking shoppers into clicking buttons they can't see. This can lead to unauthorized purchases, stolen account credentials, or fraudulent transactions, directly costing you revenue and eroding customer trust. Search engines and security scanners flag this missing header as a vulnerability under OWASP A05:2021 (Security Misconfiguration), which can affect your site's security rating and enterprise buyer trust. Many payment card industry (PCI DSS) compliance checklists also require it, so missing it can jeopardize your ability to process card payments.
See the complete Missing x frame options guide for every platform and the full background.
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