diff --git a/config/default.ts b/config/default.ts
index 9888df4..4e3995c 100644
--- a/config/default.ts
+++ b/config/default.ts
@@ -8,7 +8,7 @@ export default {
     public_url: "http://localhost:4899",
     public_websocket_url: "ws://localhost:4899",
     port: 4899,
-    gitlab_webhook_token: 'secret',
+    gitlab_webhook_token: 'default',
     mysql: {
         connectionLimit: 10,
         host: "localhost",
@@ -23,7 +23,7 @@ export default {
         prefix: 'wms'
     },
     session: {
-        secret: "very_secret_not_known",
+        secret: 'default',
         cookie: {
             secure: false,
             maxAge: 30 * 24 * 3600 * 1000, // 30 days
diff --git a/src/Application.ts b/src/Application.ts
index 17a23f5..a9bb87f 100644
--- a/src/Application.ts
+++ b/src/Application.ts
@@ -62,6 +62,11 @@ export default abstract class Application {
         // Register all components and alike
         await this.init();
 
+        // Security
+        if (process.env.NODE_ENV === 'production') {
+            await this.checkSecuritySettings();
+        }
+
         // Init express
         const app = express();
         const initRouter = express.Router();
@@ -171,6 +176,12 @@ export default abstract class Application {
         return false;
     }
 
+    private async checkSecuritySettings(): Promise<void> {
+        for (const component of this.components) {
+            await component.checkSecuritySettings();
+        }
+    }
+
     async stop(): Promise<void> {
         Logger.info('Stopping application...');
 
diff --git a/src/ApplicationComponent.ts b/src/ApplicationComponent.ts
index 200c5fb..1482e73 100644
--- a/src/ApplicationComponent.ts
+++ b/src/ApplicationComponent.ts
@@ -2,11 +2,16 @@ import {Express, Router} from "express";
 import Logger from "./Logger";
 import {sleep} from "./Utils";
 import Application from "./Application";
+import config from "config";
+import SecurityError from "./SecurityError";
 
 export default abstract class ApplicationComponent<T> {
     private val?: T;
     protected app?: Application;
 
+    public async checkSecuritySettings(): Promise<void> {
+    }
+
     public async start(app: Express): Promise<void> {
     }
 
@@ -60,4 +65,10 @@ export default abstract class ApplicationComponent<T> {
             Logger.error(e, `An error occurred while closing the ${thingName}.`);
         }
     }
-}
\ No newline at end of file
+
+    protected checkSecurityConfigField(field: string) {
+        if (!config.has(field) || config.get<string>(field) === 'default') {
+            throw new SecurityError('field not configured.');
+        }
+    }
+}
diff --git a/src/SecurityError.ts b/src/SecurityError.ts
new file mode 100644
index 0000000..0122dcc
--- /dev/null
+++ b/src/SecurityError.ts
@@ -0,0 +1,8 @@
+export default class SecurityError implements Error {
+    public readonly name: string = 'SecurityError';
+    public readonly message: string;
+
+    public constructor(message: string) {
+        this.message = message;
+    }
+}
\ No newline at end of file
diff --git a/src/components/AutoUpdateComponent.ts b/src/components/AutoUpdateComponent.ts
index cc275ca..0f82972 100644
--- a/src/components/AutoUpdateComponent.ts
+++ b/src/components/AutoUpdateComponent.ts
@@ -6,6 +6,10 @@ import {ForbiddenHttpError} from "../HttpError";
 import Logger from "../Logger";
 
 export default class AutoUpdateComponent extends ApplicationComponent<void> {
+    public async checkSecuritySettings(): Promise<void> {
+        this.checkSecurityConfigField('gitlab_webhook_token');
+    }
+
     public async init(router: Router): Promise<void> {
         router.post('/update/push.json', (req, res) => {
             const token = req.header('X-Gitlab-Token');
diff --git a/src/components/MailComponent.ts b/src/components/MailComponent.ts
index 20f2db7..d42a1d7 100644
--- a/src/components/MailComponent.ts
+++ b/src/components/MailComponent.ts
@@ -1,8 +1,21 @@
 import ApplicationComponent from "../ApplicationComponent";
 import {Express} from "express";
 import Mail from "../Mail";
+import config from "config";
+import SecurityError from "../SecurityError";
 
 export default class MailComponent extends ApplicationComponent<void> {
+
+
+    public async checkSecuritySettings(): Promise<void> {
+        if (!config.get<boolean>('mail.secure')) {
+            throw new SecurityError('Cannot set mail.secure to false');
+        }
+        if (config.get<boolean>('mail.allow_invalid_tls')) {
+            throw new SecurityError('Cannot set mail.allow_invalid_tls to true');
+        }
+    }
+
     public async start(app: Express): Promise<void> {
         await this.prepare('Mail connection', () => Mail.prepare());
     }
diff --git a/src/components/SessionComponent.ts b/src/components/SessionComponent.ts
index d06e975..2409d8c 100644
--- a/src/components/SessionComponent.ts
+++ b/src/components/SessionComponent.ts
@@ -4,6 +4,7 @@ import config from "config";
 import RedisComponent from "./RedisComponent";
 import flash from "connect-flash";
 import {Router} from "express";
+import SecurityError from "../SecurityError";
 
 export default class SessionComponent extends ApplicationComponent<void> {
     private readonly storeComponent: RedisComponent;
@@ -13,6 +14,14 @@ export default class SessionComponent extends ApplicationComponent<void> {
         this.storeComponent = storeComponent;
     }
 
+
+    public async checkSecuritySettings(): Promise<void> {
+        this.checkSecurityConfigField('session.secret');
+        if (!config.get<boolean>('session.cookie.secure')) {
+            throw new SecurityError('Cannot set cookie secure field to false.');
+        }
+    }
+
     public async init(router: Router): Promise<void> {
         router.use(session({
             saveUninitialized: true,