How to fix x frame options weak on BigCommerce
Change the X-Frame-Options response header from its current weak or missing value to either DENY or SAMEORIGIN so your store cannot be embedded in a malicious iframe.
Steps for BigCommerce
- BigCommerce SaaS storefronts set X-Frame-Options automatically; use DevTools to confirm it is present on your live store.
- If your store sits behind a CDN such as Cloudflare, go to Cloudflare dashboard → your domain → Rules → Transform Rules → Modify Response Header → Create rule → Add header: Name = X-Frame-Options, Value = DENY. Set it to apply to all requests matching your hostname.
- For BigCommerce headless (Next.js / React) storefronts deployed on Vercel: add to vercel.json: { "headers": [{ "source": "/(.*)", "headers": [{ "key": "X-Frame-Options", "value": "DENY" }] }] }
- For headless storefronts on Netlify: add to netlify.toml: [[headers]] for = "/*" [headers.values] X-Frame-Options = "DENY"
X-Frame-Options: DENYWhat is x frame options weak?
The X-Frame-Options HTTP header is a one-line instruction your web server sends to every visitor's browser telling it whether your store's pages are allowed to be loaded inside an iframe (a "page within a page") on another website. There are two safe values: DENY (no site, including your own, can frame your pages) and SAMEORIGIN (only pages on your own domain can frame them). A weak or absent value means any website on the internet can load your store inside an invisible or disguised iframe — a classic attack called clickjacking.
Clickjacking lets attackers overlay your real checkout or login page inside a transparent iframe on a fake site, tricking customers into clicking buttons they can't see — handing over payment details, credentials, or completing purchases they didn't intend. This is a direct revenue, fraud, and brand-trust risk. It also violates PCI-DSS requirements around protecting cardholder data environments and can expose you to legal liability if customers are defrauded through your site. Google's Safe Browsing program can flag sites involved in such abuse, which destroys organic search rankings overnight.
See the complete X frame options weak guide for every platform and the full background.
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