# Preventing broken access control in express Node.js applications

DevFeed: [Preventing broken access control in express Node.js applications](<https://devfeed.tech/articles/preventing-broken-access-control-in-express-node-js-applications-8049.md>)

Original publisher: [Read original article](<https://snyk.io/blog/preventing-broken-access-control-express-node-js/>)

Author: Ben Smitthimedhin

Published: 2024-05-22T05:00:00Z

Content type: article

Language: en

Sources: [Blog RSS Feed | Snyk](<https://devfeed.tech/sources/blog-rss-feed-snyk.md>)

Topics: [Access Control](<https://devfeed.tech/topics/access-control.md>), [Express](<https://devfeed.tech/topics/express.md>), [Node.js](<https://devfeed.tech/topics/node-js.md>), [Vulnerabilities](<https://devfeed.tech/topics/vulnerabilities.md>), [Authorization](<https://devfeed.tech/topics/authorization.md>), [web applications](<https://devfeed.tech/topics/web-applications.md>), [Back end](<https://devfeed.tech/topics/backend.md>), [Code](<https://devfeed.tech/topics/code.md>)

Tags: [access-control](<https://devfeed.tech/tags/access-control.md>), [acquisition](<https://devfeed.tech/tags/acquisition.md>), [authorization](<https://devfeed.tech/tags/authorization.md>), [backend](<https://devfeed.tech/tags/backend.md>), [blog](<https://devfeed.tech/tags/blog.md>), [code](<https://devfeed.tech/tags/code.md>), [code-security](<https://devfeed.tech/tags/code-security.md>), [developer](<https://devfeed.tech/tags/developer.md>), [draftdotdev](<https://devfeed.tech/tags/draftdotdev.md>), [express](<https://devfeed.tech/tags/express.md>), [javascript](<https://devfeed.tech/tags/javascript.md>), [js](<https://devfeed.tech/tags/js.md>), [middleware](<https://devfeed.tech/tags/middleware.md>), [node-js](<https://devfeed.tech/tags/node-js.md>), [open-source-security](<https://devfeed.tech/tags/open-source-security.md>), [snyk-code](<https://devfeed.tech/tags/snyk-code.md>), [snyk-open-source](<https://devfeed.tech/tags/snyk-open-source.md>), [vulnerabilities](<https://devfeed.tech/tags/vulnerabilities.md>), [vulnerability](<https://devfeed.tech/tags/vulnerability.md>), [web-applications](<https://devfeed.tech/tags/web-applications.md>)

## AI overview

This article explains broken access control in backend Node.js applications built with Express. It describes how flawed authorization rules can expose private data, permit restricted actions, or allow privilege escalation, and introduces code examples of vertical access control vulnerabilities such as unprotected administrative routes.

## Source excerpt

In this article, you'll learn more about broken access control in Node.js applications and strategies to prevent such vulnerabilities when building web applications based on the Express web framework.