The most common security vulnerabilities in Replit applications—and how to fix them before attackers find them.
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Common vulnerabilities found in Replit applications
API keys and passwords visible in public Repl source code.
Immediate credential exposure to anyone browsing Replit.
Check if Repl is public and contains any hardcoded secrets.
Use Replit Secrets feature. Make Repl private if needed.
Database connection strings with passwords in code.
Direct database access by attackers.
Search for connection strings, DATABASE_URL, etc.
Store in Replit Secrets. Never hardcode connection strings.
Developers using .env files instead of Replit's Secrets feature.
.env may be visible in file browser for public Repls.
Check for .env files vs use of Replit Secrets.
Migrate all secrets to Replit Secrets tab.
Commands with secrets visible in shell history.
Credentials visible to anyone with shell access.
Check .bash_history or shell history in Repl.
Clear history. Never type secrets in commands.
Replit AI agent can make destructive database changes.
Data loss, schema corruption, unintended modifications.
Review AI agent actions in Replit history.
Review AI changes before accepting. Use database backups.
Application accessible over HTTP.
Man-in-the-middle attacks, credential interception.
Try accessing via http:// instead of https://.
Replit generally handles this, but verify in production deployments.
Development ports exposed beyond intended audience.
Unintended access to development services.
Check which ports are accessible externally.
Configure Repl to only expose intended ports.
VAS scans your Replit app for all these issues automatically. Free scan, instant results.
Scan Your App NowThe most common issues are: exposed API keys/secrets, missing database access controls (RLS or Security Rules), weak authentication configuration, and missing security headers. These account for over 80% of vulnerabilities in Replit applications.
Run a VAS security scan for automated detection of common vulnerabilities. Manually check: database access controls, search code for hardcoded secrets, verify authentication settings, and test security headers. VAS catches all of these automatically.
Yes, nearly all Replit security issues are configuration problems with straightforward fixes. Missing RLS, exposed secrets, weak auth—all have clear remediation steps. Most fixes take under an hour to implement.
Exposed databases and API keys can be discovered within minutes using automated scanners. Attackers actively scan for common patterns. This is why security configuration must happen before deployment, not after.
Replit provides security features, but they require configuration. Security isn't automatic—you must enable database access controls, manage secrets properly, configure auth settings, and add security headers. The tools exist; you must use them.
Last updated: January 16, 2026