Securing Server Events in FiveM Scripts: A Short Checklist
Most money and item exploits on FiveM servers come from the same mistake: a script trusts the client. A modder can trigger any network event with any arguments, so every server event has to assume the request might be fake. Here is a short checklist I run through on every script before it goes live. 1. Never accept amounts from the client If a client event says "pay me 500", a modder will send…
FiveM servers often suffer from money and item exploits due to a common oversight: trusting client-side scripts. Any player can manipulate network events and arguments, so server events must treat all requests as potentially fraudulent. To mitigate this risk, follow this checklist before deploying any script.
Firstly, never accept amounts directly from the client. Even if the client specifies 500, a malicious user could send 5000000. Instead, the server should determine the amount using its own configuration. For instance, RegisterNetEvent (job:pay, function (amount) Bridge.AddMoney(source, amount) end) should be replaced with RegisterNetEvent (job:pay, function () local src = source Bridge.AddMoney(src, Config.Payout) end).
Secondly, verify the player's job, distance, and task state before awarding any rewards. Ensure the player possesses the correct job, is within proximity of the designated location, and has initiated the task. This helps prevent unauthorized money transfers.
Thirdly, implement cooldowns by logging the timestamp for each player. Reject events that arrive faster than a human could realistically complete the task. This prevents rapid-fire triggers even if all other checks pass.
Fourthly, log any suspicious calls. When a check fails, record the player's identifier and the event name. While occasional failures may be due to lag, hundreds of failures per minute typically indicate event injection from an injected script.
Lastly, prefer open-source scripts that you can inspect. Escrowed resources force you to trust the author's work. Open source resources, like those offered by xFiveM Shop, allow you to review all events before installation. Their QBCore, ESX, and RedM resources are available unescrowed, along with installation instructions at xfivem.shop/help/installation.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
