diff --git a/LaunchServer/source/auth/handler/MySQLAuthHandler.java b/LaunchServer/source/auth/handler/MySQLAuthHandler.java
index 67d12ca..56723af 100644
--- a/LaunchServer/source/auth/handler/MySQLAuthHandler.java
+++ b/LaunchServer/source/auth/handler/MySQLAuthHandler.java
@@ -46,13 +46,13 @@
 			block.getEntryValue("serverIDColumn", StringConfigEntry.class));
 
 		// Prepare SQL queries
-		queryByUUIDSQL = String.format("SELECT %s, %s, %s, %s FROM %s WHERE %s=?",
+		queryByUUIDSQL = String.format("SELECT %s, %s, %s, %s FROM %s WHERE %s=? LIMIT 1",
 			uuidColumn, usernameColumn, accessTokenColumn, serverIDColumn, table, uuidColumn);
-		queryByUsernameSQL = String.format("SELECT %s, %s, %s, %s FROM %s WHERE %s=?",
+		queryByUsernameSQL = String.format("SELECT %s, %s, %s, %s FROM %s WHERE %s=? LIMIT 1",
 			uuidColumn, usernameColumn, accessTokenColumn, serverIDColumn, table, usernameColumn);
-		updateAuthSQL = String.format("UPDATE %s SET %s=?, %s=? WHERE %s=?",
+		updateAuthSQL = String.format("UPDATE %s SET %s=?, %s=? WHERE %s=? LIMIT 1",
 			table, usernameColumn, accessTokenColumn, uuidColumn);
-		updateServerIDSQL = String.format("UPDATE %s SET %s=? WHERE %s=?",
+		updateServerIDSQL = String.format("UPDATE %s SET %s=? WHERE %s=? LIMIT 1",
 			table, serverIDColumn, uuidColumn);
 
 		// Fetch all entries
diff --git a/compat/auth/dle.sql b/compat/auth/dle.sql
index a2c2c49..633b2bc 100644
--- a/compat/auth/dle.sql
+++ b/compat/auth/dle.sql
@@ -1 +1 @@
-SELECT name FROM dle_users WHERE (email=? OR name=?) AND password=MD5(MD5(?))
\ No newline at end of file
+SELECT name FROM dle_users WHERE (email=? OR name=?) AND password=MD5(MD5(?)) LIMIT 1
diff --git a/compat/auth/joomla.sql b/compat/auth/joomla.sql
index 03d7ca9..7c192c5 100644
--- a/compat/auth/joomla.sql
+++ b/compat/auth/joomla.sql
@@ -1 +1 @@
-SELECT username FROM joomla_users WHERE (email=? OR username=?) AND password=CONCAT_WS(':', MD5(CONCAT(?, SUBSTRING_INDEX(SUBSTRING_INDEX(password, ':', 2), ':', -1))), SUBSTRING_INDEX(SUBSTRING_INDEX(password, ':', 2), ':', -1))
\ No newline at end of file
+SELECT username FROM joomla_users WHERE (email=? OR username=?) AND password=CONCAT_WS(':', MD5(CONCAT(?, SUBSTRING_INDEX(SUBSTRING_INDEX(password, ':', 2), ':', -1))), SUBSTRING_INDEX(SUBSTRING_INDEX(password, ':', 2), ':', -1)) LIMIT 1
\ No newline at end of file