Vercel fixes
21 guides include a Vercel section. This page only lists those sections. It is not a copy of the full catalog, and a sponsor does not change which guides appear or their order.
- criticalUpdated Oct 12, 2026
Auth checked only in the UI in Vercel
Deployment protection (a Vercel login in front of a preview) protects the preview URL. It does not protect your production API from the public internet.
- criticalUpdated Oct 12, 2026
Exposed .env files and debug endpoints in Vercel
Set environment variables in the project settings, scoped to the environments that need them. Do not commit them for "convenience." If the host offers a way to mark a variable sensitive so the dashboard stops showing the value, use it.
- criticalUpdated Oct 12, 2026
Firebase rules left open in Vercel
Hosting on Vercel does not deploy Firebase rules. Deploy them with Firebase.
- criticalUpdated Oct 12, 2026
IDOR: reading or changing someone else's data in Vercel
Nothing about the host fixes this. The check lives in the query or the database policy.
- criticalUpdated Oct 12, 2026
Keys committed to GitHub in Vercel
Update the environment variable to the new value and redeploy. Remove the secret from any preview deployment that built the bad commit.
- criticalUpdated Oct 12, 2026
No cap on LLM API spend in Vercel
Function duration limits stop a hung request. They do not cap a thousand short requests.
- criticalUpdated Oct 12, 2026
Open storage buckets in Vercel
If files live on Vercel Blob or another store, start from private access and issue signed reads. Check that product's docs for the exact flag.
- criticalUpdated Oct 12, 2026
Secret keys shipped in the frontend in Vercel
Put the secret in the project's environment variables for Production, Preview, and Development as needed. Do not prefix it with NEXT PUBLIC .
- criticalUpdated Oct 12, 2026
Server Actions with no auth check in Vercel
Server Actions work on Vercel the same way. Deployment protection on a preview does not authorize production actions.
- criticalUpdated Oct 12, 2026
Supabase tables without row level security in Vercel
Vercel hosts the app. It does not enable RLS on your Supabase project.
- criticalUpdated Oct 12, 2026
Unverified Stripe webhooks in Vercel
The Route Handler above works on Vercel. Put STRIPE WEBHOOK SECRET and STRIPE SECRET KEY in project environment variables.
- highUpdated Oct 12, 2026
CORS wide open in Vercel
You can set headers in vercel.json or next.config.ts . A static header on /api/:path is the bug if those routes use cookies.
- highUpdated Oct 12, 2026
Cross-site scripting (XSS) in Vercel
A header such as Content-Security-Policy on the deployment limits script sources. Set it in next.config or vercel.json .
- highUpdated Oct 12, 2026
No rate limiting on auth or paid API routes in Vercel
Vercel documents a firewall in front of deployments. Which rules are included on which plan changes, so check the current Vercel docs before you rely on it as the only limit.
- highUpdated Oct 12, 2026
Prompt injection in LLM features in Vercel
No platform flag turns prompt injection off. Limits on the function's duration stop a runaway loop.
- highUpdated Oct 12, 2026
SQL injection in Vercel
The host runs your function. It does not parameterize your SQL.
- highUpdated Oct 12, 2026
Unsafe file uploads in Vercel
If you use Vercel Blob or similar, the same rules apply: private by default, random names, size cap, and do not redirect users to a same-site HTML upload. Check that product's current docs for the exact ACL field.
- highUpdated Oct 12, 2026
Weak password reset in Vercel
No host setting fixes a bad reset route. Do not put the token in a rewrite or a query parameter you then send to an analytics domain.
- mediumUpdated Oct 13, 2026
Missing privacy policy and terms in Vercel
Hosting logs can include IP addresses. If you deploy there, say that the host logs requests.
- mediumUpdated Oct 12, 2026
Missing security headers in Vercel
vercel.json can set the same headers. Do not set them twice in conflict.
- mediumUpdated Oct 12, 2026
Outdated dependencies in Vercel
Vercel builds what you pushed. It does not patch your node modules .
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