diff --git a/lib/csp.js b/lib/csp.js
new file mode 100644
index 00000000..d37a382f
--- /dev/null
+++ b/lib/csp.js
@@ -0,0 +1,28 @@
+const CSP = {
+  "default-src": [
+    "'self'",
+  ],
+  "script-src": [
+    "https://code.jquery.com",
+    "https://cdn.jsdelivr.net",
+    "https://cdnjs.cloudflare.com",
+    "https://stackpath.bootstrapcdn.com",
+    "'unsafe-inline'",
+    "'unsafe-eval'",
+    "'self'",
+  ],
+  "style-src": [
+    "https://cdn.jsdelivr.net",
+    "https://stackpath.bootstrapcdn.com",
+    "https://fonts.googleapis.com",
+    "https://unpkg.com",
+    "'self'",
+  ],
+  "font-src": [
+    "https://fonts.gstatic.com",
+  ],
+};
+
+module.exports = Object.entries(CSP)
+    .map(([type, values]) => `${type} ${values.join(" ")}`)
+    .join("; ")
diff --git a/lib/middlewares/express.js b/lib/middlewares/express.js
index f021d773..92bc8493 100644
--- a/lib/middlewares/express.js
+++ b/lib/middlewares/express.js
@@ -1,12 +1,19 @@
 const path = require("path");
 const express = require("express");
 const bodyParser = require("body-parser");
+const csp = require("../csp");
 
 module.exports = (agendash) => {
   const { api, requeueJobs, deleteJobs, createJob } = agendash;
   const app = express();
   app.use(bodyParser.json());
   app.use(bodyParser.urlencoded({ extended: false }));
+
+  app.use((req, res, next) => {
+    res.header("Content-Security-Policy", csp);
+    next();
+  });
+
   app.use("/", express.static(path.join(__dirname, "../../public")));
 
   app.get("/api", async (request, response) => {
diff --git a/lib/middlewares/fastify.js b/lib/middlewares/fastify.js
index e9fb74ee..fdd95fca 100644
--- a/lib/middlewares/fastify.js
+++ b/lib/middlewares/fastify.js
@@ -1,4 +1,5 @@
 const path = require("path");
+const csp = require("../csp");
 
 module.exports = (agendash) => (instance, opts, done) => {
   const { api, requeueJobs, deleteJobs, createJob } = agendash;
@@ -8,6 +9,7 @@ module.exports = (agendash) => (instance, opts, done) => {
   });
 
   instance.get("/", function (req, reply) {
+    reply.header("Content-Security-Policy", csp);
     return reply.sendFile("index.html");
   });
 
diff --git a/lib/middlewares/hapi.js b/lib/middlewares/hapi.js
index fe931430..aba3b674 100644
--- a/lib/middlewares/hapi.js
+++ b/lib/middlewares/hapi.js
@@ -1,11 +1,17 @@
 const path = require("path");
 const pack = require("../../package.json");
+const csp = require("../csp");
 
 module.exports = (agendash) => {
   const { api, requeueJobs, deleteJobs, createJob } = agendash;
   return {
     pkg: pack,
     register: (server, options) => {
+      server.ext("onPreResponse", (req, h) => {
+        req.response.header("Content-Security-Policy", csp);
+        return h.continue;
+      });
+
       server.route([
         {
           method: "GET",
diff --git a/lib/middlewares/koa.js b/lib/middlewares/koa.js
index 13efa9bc..4737bb4d 100644
--- a/lib/middlewares/koa.js
+++ b/lib/middlewares/koa.js
@@ -2,10 +2,16 @@ const path = require("path");
 const bodyParser = require("koa-bodyparser");
 const Router = require("koa-router");
 const koaStatic = require("koa-static");
+const csp = require("../csp");
 
 module.exports = (agendash) => {
   const middlewares = [];
 
+  middlewares.push(async (ctx, next) => {
+    await next();
+    ctx.set("Content-Security-Policy", csp);
+  });
+
   middlewares.push(
     koaStatic(path.resolve(__dirname, "../../public"), { defer: true })
   );