diff --git a/website/server/middlewares/cors.js b/website/server/middlewares/cors.js
index d6791da443..c401956a53 100644
--- a/website/server/middlewares/cors.js
+++ b/website/server/middlewares/cors.js
@@ -5,6 +5,8 @@ export default function corsMiddleware (req, res, next) {
     'Access-Control-Allow-Headers': 'Authorization,Content-Type,Accept,Content-Encoding,X-Requested-With,x-api-user,x-api-key,x-client',
     // Expose rate limit headers to CORS requests
     'Access-Control-Expose-Headers': 'X-RateLimit-Limit,X-RateLimit-Remaining,X-RateLimit-Reset,Retry-After',
+    // Content-Security-Policy based on Helmet defaults
+    'Content-Security-Policy': "default-src 'self' habitica.com *.habitica.com *.amazon.com *.amazonaws.com *.amplitude.com *.loggly.com *.payments-amazon.com *.stripe.com *.stripe.network; base-uri 'self'; font-src 'self' https: data:; form-action 'self'; frame-ancestors 'self'; img-src * data:; object-src 'none'; script-src-attr 'none'; style-src 'self' https: 'unsafe-inline'",
   });
   if (req.method === 'OPTIONS') return res.sendStatus(200);
   return next();