roblox-security

Roblox Security

When to Load

Load for authority, remote abuse, economy, saves, bans, or sandboxing audits. Remote validation/rate limits: roblox-networking.

Quick Reference

Core: Client is always compromised. The server remains the source of truth, but the implementation depends on the authority model.

Authority Models

• Classic replication: validate client requests against server state. Never trust client damage, currency, inventory, permissions, or positions.
• Server Authority: Workspace.AuthorityMode = Server: the server owns core simulation while clients predict and recover from misprediction. Use BindToSimulation() (needs UseFixedSimulation), not blanket Heartbeat correction. Cheap for stock characters, rewrite-scale for authored simulation (full.md).
• Both: validate attacks, purchases, teleports, permissions, and custom remotes at the server boundary.

Audit Checklist

CRITICAL: Server-authoritative state · Documented authority model · Validate all arg types · Rate limit remotes · Session-lock DataStore · No client currency mutations · ProcessReceipt verification · No secrets in client code

HIGH: Validate custom movement and action transitions · BindToClose protection · Atomic trading · Never trust client values · Use InputActions for simulation input in Server Authority projects · Validate ProximityPrompt/ClickDetector/DragDetector like remotes

MEDIUM: Server cooldowns · server-computed leaderboards · anti-AFK reward checks · TextService filtering · Script sandboxing for third-party code

Enforcement

Enforcement is a product decision with appeal implications. Players:BanAsync/UnbanAsync are server-only and need Players.BanningEnabled; pcall them. Duration, reason limits and device blocks: full.md.

Anti-Patterns

Don't obfuscate client code, use _G for security, kick without logging, over-validate movement, or rely on client anti-cheat.

See references/full.md for detailed examples.