Flask Security Best Practices for Software Engineers

Hi all,

I'm Ahmad, founder of Corgea. We've built a scanner that can find vulnerabilities in Flask applications, so we decided to write a guide for software engineers on Flask security best practices:

https://corgea.com/Learn/flask-security-best-practices-2025

In this article, we’ve covered:

• Common Flask security misconfigurations we keep seeing in the wild
• How to safely manage your secret keys, sessions, and cookies
• Input validation and preventing common attacks like XSS and SQL Injection
• Best practices for authentication and password storage
• Deployment hardening tips (headers, HTTPS, etc.)
• Real code examples for each practice

We’ve written this with both new Flask developers and experienced engineers in mind.

Would love feedback from the community → What’s a Flask security mistake you’ve seen (or made 😅) that others should know about?

Anything else you’d like us to add in future updates?

PS: We love Flask and have used it for some of our services ❤️