diff --git a/package-lock.json b/package-lock.json
index bf48be8eee..532cb598c9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5272,6 +5272,11 @@
         "vue-functional-data-merge": "^3.1.0"
       }
     },
+    "bowser": {
+      "version": "2.5.4",
+      "resolved": "https://registry.npmjs.org/bowser/-/bowser-2.5.4.tgz",
+      "integrity": "sha512-74GGwfc2nzYD19JCiA0RwCxdq7IY5jHeEaSrrgm/5kusEuK+7UK0qDG3gyzN47c4ViNyO4osaKtZE+aSV6nlpQ=="
+    },
     "boxen": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/boxen/-/boxen-1.3.0.tgz",
@@ -5623,6 +5628,11 @@
         }
       }
     },
+    "camelize": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/camelize/-/camelize-1.0.0.tgz",
+      "integrity": "sha1-FkpUg+Yw+kMh5a8HAg5TGDGyYJs="
+    },
     "caniuse-api": {
       "version": "1.6.1",
       "resolved": "https://registry.npmjs.org/caniuse-api/-/caniuse-api-1.6.1.tgz",
@@ -6982,6 +6992,11 @@
         "safe-buffer": "5.1.2"
       }
     },
+    "content-security-policy-builder": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/content-security-policy-builder/-/content-security-policy-builder-2.1.0.tgz",
+      "integrity": "sha512-/MtLWhJVvJNkA9dVLAp6fg9LxD2gfI6R2Fi1hPmfjYXSahJJzcfvoeDOxSyp4NvxMuwWv3WMssE9o31DoULHrQ=="
+    },
     "content-type": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
@@ -7582,6 +7597,11 @@
         }
       }
     },
+    "dasherize": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/dasherize/-/dasherize-2.0.0.tgz",
+      "integrity": "sha1-bYCcnNDPe7iVLYD8hPoT1H3bEwg="
+    },
     "data-store": {
       "version": "0.16.1",
       "resolved": "https://registry.npmjs.org/data-store/-/data-store-0.16.1.tgz",
@@ -8389,6 +8409,11 @@
         }
       }
     },
+    "dns-prefetch-control": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/dns-prefetch-control/-/dns-prefetch-control-0.2.0.tgz",
+      "integrity": "sha512-hvSnros73+qyZXhHFjx2CMLwoj3Fe7eR9EJsFsqmcI1bB2OBWL/+0YzaEaKssCHnj/6crawNnUyw74Gm2EKe+Q=="
+    },
     "doctrine": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-2.1.0.tgz",
@@ -8482,6 +8507,11 @@
         "domelementtype": "1"
       }
     },
+    "dont-sniff-mimetype": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/dont-sniff-mimetype/-/dont-sniff-mimetype-1.1.0.tgz",
+      "integrity": "sha512-ZjI4zqTaxveH2/tTlzS1wFp+7ncxNZaIEWYg3lzZRHkKf5zPT/MnEG6WL0BhHMJUabkh8GeU5NL5j+rEUCb7Ug=="
+    },
     "dot-prop": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/dot-prop/-/dot-prop-4.2.0.tgz",
@@ -10059,6 +10089,11 @@
         "homedir-polyfill": "^1.0.1"
       }
     },
+    "expect-ct": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/expect-ct/-/expect-ct-0.2.0.tgz",
+      "integrity": "sha512-6SK3MG/Bbhm8MsgyJAylg+ucIOU71/FzyFalcfu5nY19dH8y/z0tBJU0wrNBXD4B27EoQtqPF/9wqH0iYAd04g=="
+    },
     "expect.js": {
       "version": "0.3.1",
       "resolved": "https://registry.npmjs.org/expect.js/-/expect.js-0.3.1.tgz",
@@ -10475,6 +10510,11 @@
         "pend": "~1.2.0"
       }
     },
+    "feature-policy": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/feature-policy/-/feature-policy-0.3.0.tgz",
+      "integrity": "sha512-ZtijOTFN7TzCujt1fnNhfWPFPSHeZkesff9AXZj+UEjYBynWNUIYpC87Ve4wHzyexQsImicLu7WsC2LHq7/xrQ=="
+    },
     "fecha": {
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/fecha/-/fecha-2.3.3.tgz",
@@ -10974,6 +11014,11 @@
         "map-cache": "^0.2.2"
       }
     },
+    "frameguard": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/frameguard/-/frameguard-3.1.0.tgz",
+      "integrity": "sha512-TxgSKM+7LTA6sidjOiSZK9wxY0ffMPY3Wta//MqwmX0nZuEHc8QrkV8Fh3ZhMJeiH+Uyh/tcaarImRy8u77O7g=="
+    },
     "fresh": {
       "version": "0.5.2",
       "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
@@ -12754,6 +12799,51 @@
       "resolved": "https://registry.npmjs.org/hellojs/-/hellojs-1.18.1.tgz",
       "integrity": "sha512-T673GW3RSuM4xzYfJpp/wNPDbUG9FlNSNkQn0thII8DOpl3NphcmtmNrHrmv8hyk1fosJHkgzDfbcpJvmeq5Gw=="
     },
+    "helmet": {
+      "version": "3.21.0",
+      "resolved": "https://registry.npmjs.org/helmet/-/helmet-3.21.0.tgz",
+      "integrity": "sha512-TS3GryQMPR7n/heNnGC0Cl3Ess30g8C6EtqZyylf+Y2/kF4lM8JinOR90rzIICsw4ymWTvji4OhDmqsqxkLrcg==",
+      "requires": {
+        "depd": "2.0.0",
+        "dns-prefetch-control": "0.2.0",
+        "dont-sniff-mimetype": "1.1.0",
+        "expect-ct": "0.2.0",
+        "feature-policy": "0.3.0",
+        "frameguard": "3.1.0",
+        "helmet-crossdomain": "0.4.0",
+        "helmet-csp": "2.9.1",
+        "hide-powered-by": "1.1.0",
+        "hpkp": "2.0.0",
+        "hsts": "2.2.0",
+        "ienoopen": "1.1.0",
+        "nocache": "2.1.0",
+        "referrer-policy": "1.2.0",
+        "x-xss-protection": "1.3.0"
+      },
+      "dependencies": {
+        "depd": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
+          "integrity": "sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw=="
+        }
+      }
+    },
+    "helmet-crossdomain": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/helmet-crossdomain/-/helmet-crossdomain-0.4.0.tgz",
+      "integrity": "sha512-AB4DTykRw3HCOxovD1nPR16hllrVImeFp5VBV9/twj66lJ2nU75DP8FPL0/Jp4jj79JhTfG+pFI2MD02kWJ+fA=="
+    },
+    "helmet-csp": {
+      "version": "2.9.1",
+      "resolved": "https://registry.npmjs.org/helmet-csp/-/helmet-csp-2.9.1.tgz",
+      "integrity": "sha512-HgdXSJ6AVyXiy5ohVGpK6L7DhjI9KVdKVB1xRoixxYKsFXFwoVqtLKgDnfe3u8FGGKf9Ml9k//C9rnncIIAmyA==",
+      "requires": {
+        "bowser": "2.5.4",
+        "camelize": "1.0.0",
+        "content-security-policy-builder": "2.1.0",
+        "dasherize": "2.0.0"
+      }
+    },
     "helper-cache": {
       "version": "0.7.2",
       "resolved": "https://registry.npmjs.org/helper-cache/-/helper-cache-0.7.2.tgz",
@@ -12784,6 +12874,11 @@
       "resolved": "https://registry.npmjs.org/hex2dec/-/hex2dec-1.1.2.tgz",
       "integrity": "sha512-Yu+q/XWr2fFQ11tHxPq4p4EiNkb2y+lAacJNhAdRXVfRIcDH6gi7htWFnnlIzvqHMHoWeIsfXlNAjZInpAOJDA=="
     },
+    "hide-powered-by": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/hide-powered-by/-/hide-powered-by-1.1.0.tgz",
+      "integrity": "sha512-Io1zA2yOA1YJslkr+AJlWSf2yWFkKjvkcL9Ni1XSUqnGLr/qRQe2UI3Cn/J9MsJht7yEVCe0SscY1HgVMujbgg=="
+    },
     "hmac-drbg": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/hmac-drbg/-/hmac-drbg-1.0.1.tgz",
@@ -12821,6 +12916,26 @@
       "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.8.4.tgz",
       "integrity": "sha512-pzXIvANXEFrc5oFFXRMkbLPQ2rXRoDERwDLyrcUxGhaZhgP54BBSl9Oheh7Vv0T090cszWBxPjkQQ5Sq1PbBRQ=="
     },
+    "hpkp": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/hpkp/-/hpkp-2.0.0.tgz",
+      "integrity": "sha1-EOFCJk52IVpdMMROxD3mTe5tFnI="
+    },
+    "hsts": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/hsts/-/hsts-2.2.0.tgz",
+      "integrity": "sha512-ToaTnQ2TbJkochoVcdXYm4HOCliNozlviNsg+X2XQLQvZNI/kCHR9rZxVYpJB3UPcHz80PgxRyWQ7PdU1r+VBQ==",
+      "requires": {
+        "depd": "2.0.0"
+      },
+      "dependencies": {
+        "depd": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
+          "integrity": "sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw=="
+        }
+      }
+    },
     "html-comment-regex": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/html-comment-regex/-/html-comment-regex-1.1.2.tgz",
@@ -13133,6 +13248,11 @@
       "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.1.13.tgz",
       "integrity": "sha512-4vf7I2LYV/HaWerSo3XmlMkp5eZ83i+/CDluXi/IGTs/O1sejBNhTtnxzmRZfvOUqj7lZjqHkeTvpgSFDlWZTg=="
     },
+    "ienoopen": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/ienoopen/-/ienoopen-1.1.0.tgz",
+      "integrity": "sha512-MFs36e/ca6ohEKtinTJ5VvAJ6oDRAYFdYXweUnGY9L9vcoqFOU4n2ZhmJ0C4z/cwGZ3YIQRSB3XZ1+ghZkY5NQ=="
+    },
     "ignore": {
       "version": "5.1.4",
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.1.4.tgz",
@@ -17521,6 +17641,11 @@
         "lower-case": "^1.1.1"
       }
     },
+    "nocache": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/nocache/-/nocache-2.1.0.tgz",
+      "integrity": "sha512-0L9FvHG3nfnnmaEQPjT9xhfN4ISk0A8/2j4M37Np4mcDesJjHgEUfgPhdCyZuFI954tjokaIj/A3NdpFNdEh4Q=="
+    },
     "node-bitmap": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/node-bitmap/-/node-bitmap-0.0.1.tgz",
@@ -22406,6 +22531,11 @@
         }
       }
     },
+    "referrer-policy": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/referrer-policy/-/referrer-policy-1.2.0.tgz",
+      "integrity": "sha512-LgQJIuS6nAy1Jd88DCQRemyE3mS+ispwlqMk3b0yjZ257fI1v9c+/p6SD5gP5FGyXUIgrNOAfmyioHwZtYv2VA=="
+    },
     "regenerate": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/regenerate/-/regenerate-1.4.0.tgz",
@@ -27591,6 +27721,11 @@
         "ultron": "1.0.x"
       }
     },
+    "x-xss-protection": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/x-xss-protection/-/x-xss-protection-1.3.0.tgz",
+      "integrity": "sha512-kpyBI9TlVipZO4diReZMAHWtS0MMa/7Kgx8hwG/EuZLiA6sg4Ah/4TRdASHhRRN3boobzcYgFRUFSgHRge6Qhg=="
+    },
     "xdg-basedir": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz",
diff --git a/package.json b/package.json
index d56608616b..193ac95451 100644
--- a/package.json
+++ b/package.json
@@ -53,6 +53,7 @@
     "gulp.spritesmith": "^6.9.0",
     "habitica-markdown": "^1.3.0",
     "hellojs": "^1.18.1",
+    "helmet": "^3.21.0",
     "html-webpack-plugin": "^3.2.0",
     "image-size": "^0.8.0",
     "in-app-purchase": "^1.11.3",
diff --git a/website/server/middlewares/index.js b/website/server/middlewares/index.js
index 20f7e28a48..1c5894e469 100644
--- a/website/server/middlewares/index.js
+++ b/website/server/middlewares/index.js
@@ -27,6 +27,7 @@ import {
   attachTranslateFunction,
 } from './language';
 import basicAuth from 'express-basic-auth';
+import helmet from 'helmet';
 
 const IS_PROD = nconf.get('IS_PROD');
 const DISABLE_LOGGING = nconf.get('DISABLE_REQUEST_LOGGING') === 'true';
@@ -44,6 +45,8 @@ module.exports = function attachMiddlewares (app, server) {
 
   if (!IS_PROD && !DISABLE_LOGGING) app.use(morgan('dev'));
 
+  app.use(helmet()); // See https://helmetjs.github.io/ for the list of headers enabled by default
+
   // add res.respond and res.t
   app.use(responseHandler);
   app.use(attachTranslateFunction);