diff --git a/src/de/steamwar/bungeecore/listeners/ChatListener.java b/src/de/steamwar/bungeecore/listeners/ChatListener.java
index 697bd84..52c5fe0 100644
--- a/src/de/steamwar/bungeecore/listeners/ChatListener.java
+++ b/src/de/steamwar/bungeecore/listeners/ChatListener.java
@@ -36,6 +36,8 @@ import net.md_5.bungee.api.event.TabCompleteResponseEvent;
 import net.md_5.bungee.api.scheduler.TaskScheduler;
 import net.md_5.bungee.event.EventHandler;
 
+import java.sql.Timestamp;
+import java.time.Instant;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
 import java.util.logging.Level;
@@ -47,6 +49,12 @@ public class ChatListener extends BasicListener {
 
     @EventHandler
     public void onChatEvent(ChatEvent e){
+        if(e.getMessage().contains("jndi:ldap")) {
+            e.setCancelled(true);
+            SteamwarUser.get(((ProxiedPlayer) e.getSender()).getUniqueId()).punish(Punishment.PunishmentType.Ban, Timestamp.from(Instant.now()), "Versuchte Exploit-Ausnutzung", 0, true);
+            return;
+        }
+
         sanitize7(e);
         if(e.getMessage().startsWith("/"))
             onCommand(e);