Vercel

Meets the B minimum (70/100) in our RFP clause.

With these headers missing, vercel.com is more exposed to clickjacking.

Missing 4

• Permissions-Policy 0 of 10

  Switches off browser features the product does not use, such as camera, microphone, location and payments, for the page and anything embedded in it.

  Without it: Any script or iframe on the page, including third-party ads and chat widgets, can ask the user for camera, microphone or location access under the vendor's name.

• Cross-Origin-Opener-Policy 0 of 5

  Cuts the link between the product's window and windows opened by, or opening, other sites.

  Without it: A page that opens the product keeps a handle on its window and can later redirect it to a look-alike sign-in or payment page (tab-nabbing) while the user thinks they are still on the real site. It is also part of the isolation browsers need to defend against Spectre-style attacks.

• Cross-Origin-Resource-Policy 0 of 5

  Tells browsers which sites may load this site's resources.

  Without it: Other sites can pull the product's responses into their own pages, which makes side-channel leaks of what a signed-in user can see easier.

• No version disclosure 0 of 5

  Keeps the Server and X-Powered-By headers from announcing exact software versions.

  Without it: A header like "nginx/1.18.0" or "PHP/7.4" tells an attacker which known vulnerabilities to try, and flags possibly unpatched software to every automated scanner on the internet.

Sent 5

• Content-Security-Policy 25 of 25

  default-src 'self' vercel.com *.vercel.com assets.vercel.com *.vercel.sh vercel.live wss://*.vercel.com *.codesandbox.io localhost:* chrome-extension://* https://www.youtube-nocookie.com https://risk.clearbit.com https://react-tweet.vercel.app/*;script-src 'self' 'unsafe-eval' 'unsafe-inline' 'inline-speculation-rules' https://snap.licdn.com https://www.youtube.com cdn.vercel-insights.com va.vercel-scripts.com vercel.com *.vercel.com assets.vercel.com *.vercel.sh vercel.live wss://*.vercel.com *.codesandbox.io localhost:* chrome-extension://* https://www.youtube-nocookie.com https://risk.clearbit.com https://react-tweet.vercel.app/* cdp.vercel.com;style-src 'self' 'unsafe-inline' vercel.com *.vercel.com assets.vercel.com *.vercel.sh vercel.live wss://*.vercel.com *.codesandbox.io localhost:* chrome-extension://* https://www.youtube-nocookie.com https://risk.clearbit.com https://react-tweet.vercel.app/*;img-src 'self' blob: data: *.github.io avatars.githubusercontent.com user-images.githubusercontent.com vercel.com vercel.live *.vercel.sh assets.vercel.com cdn.raster.app https://images.ctfassets.net https://www.google.com https://i.ytimg.com https://s3.amazonaws.com pbs.twimg.com https://www.gravatar.com https://lishhsx6kmthaacj.public.blob.vercel-storage.com https://fvqcrhkhgatlyl2m.public.blob.vercel-storage.com;media-src 'self' blob: data: vercel.com *.vercel.com assets.vercel.com *.vercel.sh vercel.live wss://*.vercel.com *.codesandbox.io localhost:* chrome-extension://* https://www.youtube-nocookie.com https://risk.clearbit.com https://react-tweet.vercel.app/*;connect-src 'self' data: *.ingest.sentry.io *.ingest.us.sentry.io wss://ws-us3.pusher.com sockjs-use3.pusher.com react-tweet.vercel.app https://*.contentful.com www.vercel-status.com unpkg.com vercel.com *.vercel.com assets.vercel.com *.vercel.sh vercel.live wss://*.vercel.com *.codesandbox.io localhost:* chrome-extension://* https://www.youtube-nocookie.com https://risk.clearbit.com https://react-tweet.vercel.app/* cdp.vercel.com;font-src 'self' vercel.com assets.vercel.com vercel.live fonts.gstatic.com *.vercel.sh;frame-ancestors 'self' https://vercel.com https://app.contentful.com https://*.contentful.com https://*.vercel.sh https://*.vercel.com

• Strict-Transport-Security 20 of 20

  max-age=31536000; includeSubDomains; preload

• X-Content-Type-Options 10 of 10

  nosniff

• Frame protection 10 of 10

  DENY

• Referrer-Policy 10 of 10

  origin-when-cross-origin

Checked 2026-10-06 at https://vercel.com/. Re-checked every 7 days. The grade covers the headers this website sends, not the product’s overall security. How the grade works.