Jan 14 (edited) โข General Discussion/Ask section
8 Security Mistakes That Can Hack Your SaaS
The biggest problem with ๐๐ถ๐ฏ๐ฒ ๐ฐ๐ผ๐ฑ๐ถ๐ป๐ด isn't speed.
It's ๐๐ฒ๐ฐ๐๐ฟ๐ถ๐๐.
(And here's how to fix it in ๐ด ๐๐๐ฒ๐ฝ๐)
Last month, a builder launched their SaaS.
Within 24 hours:
โ Bots hit their signup endpoint 10,000 times
โ Database crashed
โ $300 in Supabase costs
All because they shipped fast but forgot security.
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๐ง๐ต๐ฒ ๐ฝ๐ฟ๐ผ๐ฏ๐น๐ฒ๐บ ๐๐ถ๐๐ต ๐๐ถ๐ฏ๐ฒ ๐ฐ๐ผ๐ฑ๐ถ๐ป๐ด:
Your MVP works great in development.
But launch day is when the real world finds your weak spots.
Cursor moves fast.
Security doesn't come built-in.
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๐๐ฒ๐ฟ๐ฒ'๐ ๐๐ต๐ฒ ๐ด-๐๐๐ฒ๐ฝ ๐น๐ฎ๐๐ป๐ฐ๐ต ๐ฐ๐ต๐ฒ๐ฐ๐ธ๐น๐ถ๐๐:
๐ญ. ๐ฅ๐ฎ๐๐ฒ ๐น๐ถ๐บ๐ถ๐ ๐๐ผ๐๐ฟ ๐ฒ๐ป๐ฑ๐ฝ๐ผ๐ถ๐ป๐๐
โ Supabase Edge Functions + rate limiter
โ Vercel Middleware
โ Next.js IP throttling
Skip this = bots hit you 100x/second.
๐ฎ. ๐๐ป๐ฎ๐ฏ๐น๐ฒ ๐ฅ๐ผ๐-๐๐ฒ๐๐ฒ๐น ๐ฆ๐ฒ๐ฐ๐๐ฟ๐ถ๐๐ (๐ฅ๐๐ฆ)
โ Turn on RLS on every Supabase table
โ Use policies: user_id = auth.uid()
No RLS = users can query other people's data.
๐ฏ. ๐๐ฑ๐ฑ ๐๐๐ฃ๐ง๐๐๐ ๐๐ผ ๐ฎ๐๐๐ต ๐ณ๐น๐ผ๐๐
โ Signup forms
โ Login pages
โ Forgot password
AI bots can generate 1000s of fake signups in minutes.
๐ฐ. ๐๐ป๐ฎ๐ฏ๐น๐ฒ ๐ช๐๐ (๐ช๐ฒ๐ฏ ๐๐ฝ๐ฝ๐น๐ถ๐ฐ๐ฎ๐๐ถ๐ผ๐ป ๐๐ถ๐ฟ๐ฒ๐๐ฎ๐น๐น)
โ Vercel โ Settings โ Security โ WAF
โ Enable "Attack Challenge" on all routes
1 click. No code. Blocks bad traffic instantly.
๐ฑ. ๐ฆ๐ฒ๐ฐ๐๐ฟ๐ฒ ๐๐ผ๐๐ฟ ๐๐ฃ๐ ๐ธ๐ฒ๐๐
โ Store in .env files
โ Use server-only functions
โ Scan AI-generated code (it often forgets this)
If it runs on the client, assume it's public.
๐ฒ. ๐ฉ๐ฎ๐น๐ถ๐ฑ๐ฎ๐๐ฒ ๐ฎ๐น๐น ๐ถ๐ป๐ฝ๐๐๐ ๐ผ๐ป ๐๐ต๐ฒ ๐ฏ๐ฎ๐ฐ๐ธ๐ฒ๐ป๐ฑ
โ Emails, passwords, uploads
โ Custom form inputs
โ API payloads
Don't trust the frontend. Ever.
๐ณ. ๐๐น๐ฒ๐ฎ๐ป ๐๐ฝ ๐ฑ๐ฒ๐ฝ๐ฒ๐ป๐ฑ๐ฒ๐ป๐ฐ๐ถ๐ฒ๐
โ Run npm audit fix
โ Remove unused packages
โ Check for critical vulnerabilities
Cursor moves fast. It doesn't clean up after itself.
๐ด. ๐๐ฑ๐ฑ ๐บ๐ผ๐ป๐ถ๐๐ผ๐ฟ๐ถ๐ป๐ด + ๐น๐ผ๐ด๐
โ Supabase Logs
โ Vercel Analytics
โ Track failed logins, traffic spikes, 500s
You can't fix what you can't see.
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๐๐ผ๐ป๐๐: ๐๐ ๐ฐ๐ผ๐ฑ๐ฒ ๐ฟ๐ฒ๐๐ถ๐ฒ๐๐
Before you push, run CodeRabbit inside Cursor.
It catches security flaws, performance issues, and bad logic.
Like a senior dev reviewing your entire codebase.
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๐ง๐ต๐ฒ ๐ฏ๐ผ๐๐๐ผ๐บ ๐น๐ถ๐ป๐ฒ:
Cursor lets you code fast.
But you're still responsible for keeping your MVP safe.
Most builders focus on features and forget security until it's too late.
By then? Breaches. Angry users. Expensive fixes.
Secure your MVP before launch day, not after.
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8 Security Mistakes That Can Hack Your SaaS
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