---
title: "11 Authentication Mistakes and how to fix them"
url: https://daily.dev/posts/11-authentication-mistakes-and-how-to-fix-them-kil1c-fx5
source_url: https://blog.openreplay.com/11-authentication-mistakes-and-how-to-fix-them
type: article
source: "asayer"
published: 2022-08-05T00:03:36.199Z
updated: 2022-08-05T00:03:36.197Z
tags: ["security", "css", "authentication"]
reading_time: 13
upvotes: 195
comments: 4
language: en
---

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# 11 Authentication Mistakes and how to fix them

**[asayer](https://daily.dev/sources/asayer)** · 13 min read · 195 upvotes · 4 comments

## Summary

When authenticating a form on your web application, you must be careful not to display just one error message. Displaying a specific error message is dangerous because it could let an attacker use an automated trial-and-error method to determine a user’s username and password. Injection attacks, memory leaks, and compromised systems can occur if data provided in form input is not properly checked. All of the libraries I recommend for validation.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://blog.openreplay.com/11-authentication-mistakes-and-how-to-fix-them>

## Community discussion

Top comments from developers on daily.dev.

**@flavien\_lmd** · 2 upvotes

> Very good article, I will add that it is also necessary to pay attention to the error codes sent during the login. Even if the error message displayed on the page is the same whatever the error, it must be the same for the returns of the API (message and / or error code)!

**@yatsuki** · 1 upvotes

> I like this

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---

Tags: [#security](https://daily.dev/tags/security), [#css](https://daily.dev/tags/css), [#authentication](https://daily.dev/tags/authentication)

[View this post on daily.dev](https://daily.dev/posts/11-authentication-mistakes-and-how-to-fix-them-kil1c-fx5)