system: You are an expert security code reviewer. You will be shown a source code file along with a multi-select question listing several CWE (Common Weakness Enumeration) categories. Your task is to identify which of the listed CWEs are present in the code.

OUTPUT FORMAT: Respond with the letter(s) of all correct options, sorted alphabetically and comma-separated, wrapped in a single \boxed{...}. Examples: `\boxed{A}` for one correct, `\boxed{A,C}` for two, `\boxed{A,C,E}` for three. Output the boxed answer ONLY -- no explanation, no other text.

user: ```python
import os, re, json
import numpy
from math import sqrt
from .mri import MRI

class Widget(object):
    def __init__(self, fname, categorized):
        from IPython.core.display import display, Javascript
        path = os.path.abspath(os.path.join(os.path.dirname(__file__), "template/init_widget.js"))
        js = open(path).read()
        display(Javascript(js))

        self.fname = fname
        self.categorized = categorized
        self.seek = 0

    def plot(self, config={}):
        from jinja2 import Template
        from IPython.core.display import display, HTML
        from IPython.kernel.comm import Comm
        from tempfile import TemporaryFile
        from base64 import b64encode
        from uuid import uuid4

        path = os.path.abspath(os.path.join(os.path.dirname(__file__), "template/widget.html"))
        template = Template(open(path).read())

        # encode png as base64
        f = TemporaryFile("r+b")
        shape = self.categorized.to_png(f, filter=False)
        f.seek(0)
        png = "data:image/png;base64," + b64encode(f.read())
        depth, height, width = self.categorized.data.shape[1:4]
        size = {
            "width": int(width),
            "height": int(height),
            "depth": int(depth),
            "frames_per_row": int(shape[1]/width),
            "frames_per_column": int(shape[0]/height)
        }
        config.update({"voltex_size": size})

        label_rules = [[v[0], map(int, list(v[1]))] for k, v in self.categorized.label.items()]

        display(HTML(template.render(**{
            "div_id": "vis" + str(uuid4()),
            "encoded_png": png,
            "label" : label_rules,
            "config": config
        })))

        comm = Comm("IPysurfer")

        def reciever(msg):
            title = msg['content'][u'data'][u'title']
            if title == "seek":
                num = msg['content'][u'data'][u'num']
                self.seek = num
            elif title == "next":
                num = msg['content'][u'data'][u'num']
                mri = MRI.from_mgz(self.fname, start=self.seek, end=self.seek+num-1)
                comm.send({
                    "array": [mri.fold(i) for i in range(0, num)]
                })
                self.seek += num

        comm.on_msg(reciever);

```

Which of the following CWE vulnerability categories are present in this code? Multiple options may be correct.

  A) CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
  B) CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  C) CWE-643: Improper Neutralization of Data within XPath Expressions ('XPath Injection')
  D) CWE-312: Cleartext Storage of Sensitive Information
  E) CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
  F) CWE-943: Improper Neutralization of Special Elements in Data Query Logic
Answer: B