Practical security tips for the apps you’re building. Pick one small check, understand why it matters, and follow the guide when you need more.
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One small check to make your next launch a little stronger.
Browse tips & guides ↗A browser control can hide an action while the server still allows it.
Try today’s check ↗Tomorrow’s bite: Check whether your CSP is actually enforced.
From our 7-tip rotating collection. Changes daily at 00:00 UTC; tips repeat. No account needed.
Each snack has a practical action, a deeper guide and an original source. Reading time is short; fixes can take longer. Use synthetic data and your own test environment.
A successful login does not prove that each user can access only their own records.
In your own staging app, create two synthetic accounts and one private record for each. Check that each can read its own record and cannot read the other account’s record. Check the signed-out view too.
Use synthetic data and test only systems you own or have explicit permission to assess. Check every relevant role separately.
Some client keys are meant to be public. Administrative secrets are not.
Review the key types in your app’s browser bundle. Supabase publishable keys are intended for shipped clients; secret keys belong on a trusted server. Check grants and Row Level Security as well.
Do not rotate a public client key just because it is visible. If an administrative secret leaked, treat it as exposed.
A Firebase rule that accepts any authenticated user can still allow access to private data.
In your Firebase test environment, review rules that only check whether a user is signed in. For private records, check the intended owner, role or membership. Test the permitted and denied cases.
Some content is intentionally public. Match rules to your app’s intended access, rather than applying one rule everywhere.
Removing a key from today’s code does not revoke a copy someone already has.
For a real exposed secret, use its provider’s revocation or rotation process. Move the replacement to server-side secret storage, rebuild, and check the deployed files again. Review provider logs for misuse.
Never paste working secrets into a public report, support thread or AI prompt. Test new configuration before retiring access your app still needs.
A browser control can hide an action while the server still allows it.
In your staging app, confirm that protected routes enforce permissions on the server for each request. An account without the required role should receive a denial, even if it knows a record’s URL.
Use synthetic records. Public-file scans cannot prove all of your role checks or business rules.
A report-only Content Security Policy reports violations; it does not block them.
Inspect your own site’s response headers. Distinguish Content-Security-Policy from Content-Security-Policy-Report-Only. Test an appropriate policy in staging, review violations, and verify login and payment flows before enforcing it.
Do not paste a generic policy into production. A policy needs to match the resources your app uses.
Browser bundles show only part of an app’s dependency picture.
Review your own repository’s lockfile and dependency advisories, including server-side and transitive packages. For a relevant advisory, plan the upgrade, run your tests, and confirm the deployed version.
A version match needs context. A public scan cannot inventory every private dependency or prove that no vulnerable code remains.
What changes, who’s affected, and how to prepare your app.
INTERACTIVE TOOLReview twelve launch checks. Track what needs work and download your review.
DATA ACCESSUnderstand grants, policies and a two-account test plan.
START HEREBuild a wider review around code, data and deployment.
Start a free public-file scan, or explore our controlled before-and-after sample. Real reports stay private.
Only test systems you own or have explicit permission to assess. Tips and automated checks are not a security guarantee.
Tips reviewed October 21, 2026. Have a question or a topic we should cover? Send a suggestion. For occasional launch news, choose email updates; daily tip emails are not part of this feature.