The Weekend Build
Friday night. You have an idea. You open Cursor, describe what you want and start prompting. By Saturday evening, you have a working app. Login, dashboard, Stripe integration, the works.
Sunday morning, you deploy it. You post on Twitter. People sign up. It works. You feel invincible.
Monday morning, you get a DM: "Hey, I can see other users' data by changing the ID in the URL."
Sound familiar? We see this story every week.
The Answer Is Almost Certainly No
Let me be honest with you. If you built a SaaS in a weekend using AI tools and did not specifically think about security, your app has vulnerabilities. This is not a maybe. It is a near certainty.
This is not because you are bad at building. It is because AI coding assistants are bad at security. They optimize for making things work. "Make a login page" produces a login page. It does not produce a secure login page.
But here is the good news: these problems are fixable. And finding them early is cheap. Finding them after a breach is not.
What Probably Went Wrong
Your API keys are in the wrong place
AI assistants love putting API keys directly in the code. Your Stripe secret key might be in a client-side JavaScript file right now. Anyone who opens their browser's developer tools can see it.
Check your source code in the browser. Search for "sk_" or "key" or "secret". If you find anything, move it to server-side environment variables immediately.
Authorization is missing
This is the big one. Your app probably checks if someone is logged in. But does it check if they should have access to the specific data they are requesting?
Try this: log in as User A. Copy the URL of User A's dashboard. Log in as User B. Paste that URL. Can User B see User A's data? If yes, you have a broken access control vulnerability. This is the number one web application vulnerability worldwide for a reason.
Passwords might be stored wrong
If you told your AI assistant "add user authentication," it may have stored passwords in plain text or used a weak hashing algorithm. Look at your database. If you can read any password, that is a critical problem.
Passwords should be hashed with bcrypt, scrypt or Argon2. If they are in plain text or hashed with MD5, fix this before anything else.
SQL injection is likely
AI-generated code frequently builds database queries by concatenating strings. This means an attacker can type SQL commands into your search bar or login form and run them directly on your database.
The fix is parameterized queries. Every modern database library supports them. It takes 10 minutes to fix but prevents one of the most devastating attack types.
No rate limiting
Can someone try 10,000 passwords on your login form? Can they hit your API endpoint a million times? Without rate limiting, the answer is yes. This enables brute force attacks and can run up your hosting bill.
The Stuff You Cannot Check Yourself
The items above are the obvious ones. You can find and fix them on your own. But there are categories of vulnerabilities that require a trained eye.
Session management. Are your session tokens long enough? Do they expire? Can they be predicted? Are they stored securely? Can someone steal a session by getting a user to click a link?
Payment flow abuse. Can someone modify the price on the client side? Can they replay a successful payment to get free access? Can they access premium features without completing payment?
Business logic flaws. Can a user escalate their own permissions? Can they access admin functionality? Can they manipulate the order of operations to bypass checks?
These are the vulnerabilities that automated scanners miss. They require a human who understands what your app is supposed to do and can identify where it fails to enforce those rules.
What I Would Do If I Were You
Right now (free): Run through the solopreneur security checklist. Fix anything that fails. Use our free hack tool to scan your site for exposed secrets and missing headers.
This week (free): Run npm audit or your language's equivalent. Update critical dependencies. Check your environment variables. Review your authorization logic on every endpoint.
Before your next feature (paid): Get a Quick Audit. $1,500 CAD. We review your entire app, test every endpoint and give you a plain English report of what to fix. Five-day turnaround.
This Is Not Shame. This Is Reality.
Building a SaaS in a weekend is genuinely impressive. The tools we have today are extraordinary. You can go from idea to paying customers faster than ever.
But speed creates blind spots. And the biggest blind spot in the weekend-build movement is security. Not because builders do not care. Because there is no one watching. No code review. No second pair of eyes. No one asking "but what if someone does this?"
That is what a security audit is. A second pair of eyes. Someone whose entire job is to think about what could go wrong.
Think of it as hiring a senior developer for one week to review everything your AI assistant built. That is literally what a Quick Audit is. And at $1,500, it is probably less than your monthly hosting bill.
You built something real. Make sure it stays that way.