diff --git a/mRemoteNG/Config/Connections/SqlConnectionsSaver.cs b/mRemoteNG/Config/Connections/SqlConnectionsSaver.cs
index 8dc8a2877..c10bdcffd 100644
--- a/mRemoteNG/Config/Connections/SqlConnectionsSaver.cs
+++ b/mRemoteNG/Config/Connections/SqlConnectionsSaver.cs
@@ -168,7 +168,15 @@ namespace mRemoteNG.Config.Connections
             // TODO: use transaction
             System.Data.Common.DbCommand dbQuery = databaseConnector.DbCommand("TRUNCATE TABLE tblUpdate");
             dbQuery.ExecuteNonQuery();
-            dbQuery = databaseConnector.DbCommand("INSERT INTO tblUpdate (LastUpdate) VALUES('" + MiscTools.DBDate(DateTime.Now.ToUniversalTime()) + "')");
+            dbQuery = databaseConnector.DbCommand("INSERT INTO tblUpdate (LastUpdate) VALUES(@LastUpdate)");
+            
+            DbParameter lastUpdateParam = dbQuery.CreateParameter();
+            lastUpdateParam.ParameterName = "@LastUpdate";
+            // Use DBTimeStampNow() instead of DBDate() - the column is datetime type, not string
+            // DBTimeStampNow() returns the database-specific .NET type: DateTime for MSSQL, MySqlDateTime for MySQL
+            lastUpdateParam.Value = MiscTools.DBTimeStampNow();
+            dbQuery.Parameters.Add(lastUpdateParam);
+            
             dbQuery.ExecuteNonQuery();
         }
 
diff --git a/mRemoteNG/Config/Serializers/ConnectionSerializers/Sql/SqlDatabaseMetaDataRetriever.cs b/mRemoteNG/Config/Serializers/ConnectionSerializers/Sql/SqlDatabaseMetaDataRetriever.cs
index d900a9594..27fe95bc0 100644
--- a/mRemoteNG/Config/Serializers/ConnectionSerializers/Sql/SqlDatabaseMetaDataRetriever.cs
+++ b/mRemoteNG/Config/Serializers/ConnectionSerializers/Sql/SqlDatabaseMetaDataRetriever.cs
@@ -99,9 +99,22 @@ namespace mRemoteNG.Config.Serializers.ConnectionSerializers.Sql
             if (rootTreeNode != null)
             {
                 cmd = databaseConnector.DbCommand(
-                        "INSERT INTO tblRoot (Name, Export, Protected, ConfVersion) VALUES('" +
-                        MiscTools.PrepareValueForDB(rootTreeNode.Name) + "', 0, '" + strProtected + "','" +
-                        ConnectionsFileInfo.ConnectionFileVersion + "')");
+                        "INSERT INTO tblRoot (Name, Export, Protected, ConfVersion) VALUES(@Name, 0, @Protected, @ConfVersion)");
+
+                DbParameter nameParam = cmd.CreateParameter();
+                nameParam.ParameterName = "@Name";
+                nameParam.Value = rootTreeNode.Name;
+                cmd.Parameters.Add(nameParam);
+
+                DbParameter protectedParam = cmd.CreateParameter();
+                protectedParam.ParameterName = "@Protected";
+                protectedParam.Value = strProtected;
+                cmd.Parameters.Add(protectedParam);
+
+                DbParameter confVersionParam = cmd.CreateParameter();
+                confVersionParam.ParameterName = "@ConfVersion";
+                confVersionParam.Value = ConnectionsFileInfo.ConnectionFileVersion.ToString();
+                cmd.Parameters.Add(confVersionParam);
 
                 cmd.ExecuteNonQuery();
             }
@@ -111,6 +124,22 @@ namespace mRemoteNG.Config.Serializers.ConnectionSerializers.Sql
             }
         }
 
+        private bool IsValidTableName(string tableName)
+        {
+            // Table names should only contain alphanumeric characters and underscores
+            // This prevents SQL injection when table names must be used directly in queries
+            if (string.IsNullOrWhiteSpace(tableName))
+                return false;
+
+            foreach (char c in tableName)
+            {
+                if (!char.IsLetterOrDigit(c) && c != '_')
+                    return false;
+            }
+
+            return true;
+        }
+
         private bool DoesDbTableExist(IDatabaseConnector databaseConnector, string tableName)
         {
             bool exists;
@@ -119,7 +148,18 @@ namespace mRemoteNG.Config.Serializers.ConnectionSerializers.Sql
             {
                 // ANSI SQL way.  Works in PostgreSQL, MSSQL, MySQL.
                 string database_name = Properties.OptionsDBsPage.Default.SQLDatabaseName;
-                DbCommand cmd = databaseConnector.DbCommand("select case when exists((select * from information_schema.tables where table_name = '" + tableName + "' and table_schema='"+ database_name + "')) then 1 else 0 end");
+                DbCommand cmd = databaseConnector.DbCommand("select case when exists((select * from information_schema.tables where table_name = @TableName and table_schema = @DatabaseName)) then 1 else 0 end");
+                
+                DbParameter tableNameParam = cmd.CreateParameter();
+                tableNameParam.ParameterName = "@TableName";
+                tableNameParam.Value = tableName;
+                cmd.Parameters.Add(tableNameParam);
+
+                DbParameter databaseNameParam = cmd.CreateParameter();
+                databaseNameParam.ParameterName = "@DatabaseName";
+                databaseNameParam.Value = database_name;
+                cmd.Parameters.Add(databaseNameParam);
+
                 short cmdResult = Convert.ToInt16(cmd.ExecuteScalar());
                 exists = (cmdResult == 1);
             }
@@ -128,9 +168,18 @@ namespace mRemoteNG.Config.Serializers.ConnectionSerializers.Sql
                 try
                 {
                     // Other RDBMS.  Graceful degradation
-                    exists = true;
-                    DbCommand cmdOthers = databaseConnector.DbCommand("select 1 from " + tableName + " where 1 = 0");
-                    cmdOthers.ExecuteNonQuery();
+                    // Note: Table names cannot be parameterized in standard SQL.
+                    // Validate tableName to prevent SQL injection
+                    if (!IsValidTableName(tableName))
+                    {
+                        exists = false;
+                    }
+                    else
+                    {
+                        exists = true;
+                        DbCommand cmdOthers = databaseConnector.DbCommand($"select 1 from {tableName} where 1 = 0");
+                        cmdOthers.ExecuteNonQuery();
+                    }
                 }
                 catch
                 {