diff --git a/cps.py b/cps.py
index f4012293..e4b1ede8 100755
--- a/cps.py
+++ b/cps.py
@@ -72,7 +72,6 @@ def main():
     app.register_blueprint(admi)
     app.register_blueprint(remotelogin)
     app.register_blueprint(meta)
-    # if config.config_use_google_drive:
     app.register_blueprint(gdrive)
     app.register_blueprint(editbook)
     if kobo_available:
diff --git a/cps/__init__.py b/cps/__init__.py
index 70c53b85..517358c5 100644
--- a/cps/__init__.py
+++ b/cps/__init__.py
@@ -37,6 +37,11 @@ from . import config_sql, logger, cache_buster, cli, ub, db
 from .reverseproxy import ReverseProxied
 from .server import WebServer
 
+try:
+    import lxml
+    lxml_present = True
+except ImportError:
+    lxml_present = False
 
 mimetypes.init()
 mimetypes.add_type('application/xhtml+xml', '.xhtml')
@@ -90,6 +95,16 @@ db.CalibreDB.setup_db(config.config_calibre_dir, cli.settingspath)
 calibre_db = db.CalibreDB()
 
 def create_app():
+    if sys.version_info < (3, 0):
+        log.info(
+            '*** Python2 is EOL since end of 2019, this version of Calibre-Web is no longer supporting Python2, please update your installation to Python3 ***')
+        print(
+            '*** Python2 is EOL since end of 2019, this version of Calibre-Web is no longer supporting Python2, please update your installation to Python3 ***')
+        sys.exit(5)
+    if not lxml_present:
+        log.info('*** "lxml" is needed for calibre-web to run. Please install it using pip: "pip install lxml" ***')
+        print('*** "lxml" is needed for calibre-web to run. Please install it using pip: "pip install lxml" ***')
+        sys.exit(6)
     app.wsgi_app = ReverseProxied(app.wsgi_app)
     # For python2 convert path to unicode
     if sys.version_info < (3, 0):
@@ -99,12 +114,8 @@ def create_app():
 
     if os.environ.get('FLASK_DEBUG'):
         cache_buster.init_cache_busting(app)
-
     log.info('Starting Calibre Web...')
-    if sys.version_info < (3, 0):
-        log.info('*** Python2 is EOL since end of 2019, this version of Calibre-Web is no longer supporting Python2, please update your installation to Python3 ***')
-        print('*** Python2 is EOL since end of 2019, this version of Calibre-Web is no longer supporting Python2, please update your installation to Python3 ***')
-        sys.exit(5)
+
     Principal(app)
     lm.init_app(app)
     app.secret_key = os.getenv('SECRET_KEY', config_sql.get_flask_session_key(ub.session))
diff --git a/cps/admin.py b/cps/admin.py
index 93c742df..fac151b1 100644
--- a/cps/admin.py
+++ b/cps/admin.py
@@ -888,7 +888,7 @@ def list_restriction(res_type, user_id):
     else:
         json_dumps = ""
     js = json.dumps(json_dumps)
-    response = make_response(js.replace("'", '"'))
+    response = make_response(js) #.replace("'", '"')
     response.headers["Content-Type"] = "application/json; charset=utf-8"
     return response
 
diff --git a/cps/editbooks.py b/cps/editbooks.py
index fbfc4483..d8e16e4c 100644
--- a/cps/editbooks.py
+++ b/cps/editbooks.py
@@ -26,15 +26,18 @@ from datetime import datetime
 import json
 from shutil import copyfile
 from uuid import uuid4
+try:
+    from lxml.html.clean import clean_html
+except ImportError:
+    pass
+
 
 # Improve this to check if scholarly is available in a global way, like other pythonic libraries
-have_scholar = True
 try:
     from scholarly import scholarly
+    have_scholar = True
 except ImportError:
     have_scholar = False
-    pass
-
 
 from babel import Locale as LC
 from babel.core import UnknownLocaleError
@@ -57,6 +60,8 @@ except ImportError:
     pass  # We're not using Python 3
 
 
+
+
 editbook = Blueprint('editbook', __name__)
 log = logger.create()
 
@@ -459,9 +464,11 @@ def edit_book_series_index(series_index, book):
 # Handle book comments/description
 def edit_book_comments(comments, book):
     modif_date = False
+    if comments:
+        comments = clean_html(comments)
     if len(book.comments):
         if book.comments[0].text != comments:
-            book.comments[0].text = comments
+            book.comments[0].text = clean_html(comments)
             modif_date = True
     else:
         if comments:
@@ -515,6 +522,8 @@ def edit_cc_data_value(book_id, book, c, to_save, cc_db_value, cc_string):
         to_save[cc_string] = 1 if to_save[cc_string] == 'True' else 0
     elif c.datatype == 'comments':
         to_save[cc_string] = Markup(to_save[cc_string]).unescape()
+        if to_save[cc_string]:
+            to_save[cc_string] = clean_html(to_save[cc_string])
     elif c.datatype == 'datetime':
         try:
             to_save[cc_string] = datetime.strptime(to_save[cc_string], "%Y-%m-%d")
diff --git a/cps/helper.py b/cps/helper.py
index 3f91ca86..860b5bf1 100644
--- a/cps/helper.py
+++ b/cps/helper.py
@@ -38,6 +38,7 @@ from flask_login import current_user
 from sqlalchemy.sql.expression import true, false, and_, text, func
 from werkzeug.datastructures import Headers
 from werkzeug.security import generate_password_hash
+from markupsafe import escape
 
 try:
     from urllib.parse import quote
@@ -97,10 +98,11 @@ def convert_book_format(book_id, calibrepath, old_book_format, new_book_format,
         settings['body'] = _(u'This e-mail has been sent via Calibre-Web.')
     else:
         settings = dict()
-    txt = (u"%s -> %s: %s" % (
+    link = '<a href="{}">{}</a>"'.format(url_for('web.show_book', book_id=book.id), escape(book.title))  # prevent xss
+    txt = u"{} -> {}: {}".format(
            old_book_format,
            new_book_format,
-           "<a href=\"" + url_for('web.show_book', book_id=book.id) + "\">" + book.title + "</a>"))
+           link)
     settings['old_book_format'] = old_book_format
     settings['new_book_format'] = new_book_format
     WorkerThread.add(user_id, TaskConvert(file_path, book.id, txt, settings, kindle_mail, user_id))
@@ -773,7 +775,7 @@ def render_task_status(tasklist):
 
             ret['taskMessage'] = "{}: {}".format(_(task.name), task.message)
             ret['progress'] = "{} %".format(int(task.progress * 100))
-            ret['user'] = user
+            ret['user'] = escape(user)  # prevent xss
             renderedtasklist.append(ret)
 
     return renderedtasklist
diff --git a/cps/jinjia.py b/cps/jinjia.py
index 70a6090e..554bc791 100644
--- a/cps/jinjia.py
+++ b/cps/jinjia.py
@@ -31,7 +31,7 @@ from babel.dates import format_date
 from flask import Blueprint, request, url_for
 from flask_babel import get_locale
 from flask_login import current_user
-
+from markupsafe import escape
 from . import logger
 
 
@@ -129,6 +129,10 @@ def formatseriesindex_filter(series_index):
             return series_index
     return 0
 
+@jinjia.app_template_filter('escapedlink')
+def escapedlink_filter(url, text):
+    return "<a href='{}'>{}</a>".format(url, escape(text))
+
 @jinjia.app_template_filter('uuidfilter')
 def uuidfilter(var):
     return uuid4()
diff --git a/cps/static/js/libs/bootstrap-table/bootstrap-table-editable.min.js b/cps/static/js/libs/bootstrap-table/bootstrap-table-editable.min.js
index 27f5fdb8..a154f702 100644
--- a/cps/static/js/libs/bootstrap-table/bootstrap-table-editable.min.js
+++ b/cps/static/js/libs/bootstrap-table/bootstrap-table-editable.min.js
@@ -1,10 +1,10 @@
 /**
   * bootstrap-table - An extended table to integration with some of the most widely used CSS frameworks. (Supports Bootstrap, Semantic UI, Bulma, Material Design, Foundation)
   *
-  * @version v1.18.3
+  * @version v1.18.3 -> Modified to eliminate some bugs by Ozzieisaacs (don't update without appling patches again)
   * @homepage https://bootstrap-table.com
   * @author wenzhixin <wenzhixin2010@gmail.com> (http://wenzhixin.net.cn/)
   * @license MIT
   */
 
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"&quot;").replace(/'/g, "&#039;");}return d.hasOwnProperty("noEditFormatter")&&(s=d.noEditFormatter(e,a,c)),!1===s?'<a href="javascript:void(0)"\n            data-name="'.concat(r.field,'"\n            data-pk="').concat(a[t.options.idField],'"\n            data-value="').concat(f,'"\n            ').concat(i.join(""),"></a>"):s}}})))}},{key:"initBody",value:function(t){var e=this;f(i(v.prototype),"initBody",this).call(this,t),this.options.editable&&(n.default.each(this.columns,(function(t,r){if(r.editable){var o=e.getData({escape:!0}),i=e.$body.find('a[data-name="'.concat(r.field,'"]'));i.each((function(t,e){var i=n.default(e),a=i.closest("tr").data("index"),u=o[a],c=wn.calculateObjectValue(r,r.editable,[a,u,i],{});i.editable(c)})),i.off("save").on("save",(function(t,o){var i=t.currentTarget,a=o.newValue,u=n.default(i),c=e.getData(),f=u.parents("tr[data-index]").data("index"),l=c[f],s=l[r.field];if(void 0!==e.options.uniqueId&&!r.alwaysUseFormatter){var d=wn.getItemField(l,e.options.uniqueId,!1);-1===n.default.inArray(r.field+d,e.editedCells)&&e.editedCells.push(r.field+d)}a=wn.escapeHTML(a),u.data("value",a),l[r.field]=a,e.trigger("editable-save",r.field,l,f,s,u),e.initBody()})),i.off("shown").on("shown",(function(t,o){var i=t.currentTarget,a=n.default(i),u=e.getData()[a.parents("tr[data-index]").data("index")];e.trigger("editable-shown",r.field,u,a,o)})),i.off("hidden").on("hidden",(function(t,o){var i=t.currentTarget,a=n.default(i),u=e.getData()[a.parents("tr[data-index]").data("index")];e.trigger("editable-hidden",r.field,u,a,o)}))}})),this.trigger("editable-init"))}},{key:"getData",value:function(t){var e=f(i(v.prototype),"getData",this).call(this,t);if(t&&t.escape){var n,r=function(t,e){var n;if("undefined"==typeof Symbol||null==t[Symbol.iterator]){if(Array.isArray(t)||(n=s(t))||e&&t&&"number"==typeof t.length){n&&(t=n);var r=0,o=function(){};return{s:o,n:function(){return r>=t.length?{done:!0}:{done:!1,value:t[r++]}},e:function(t){throw t},f:o}}throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.")}var i,a=!0,u=!1;return{s:function(){n=t[Symbol.iterator]()},n:function(){var t=n.next();return a=t.done,t},e:function(t){u=!0,i=t},f:function(){try{a||null==n.return||n.return()}finally{if(u)throw i}}}}(e);try{for(r.s();!(n=r.n()).done;)for(var o=n.value,a=0,u=Object.entries(o);a<u.length;a++){var c=l(u[a],2),d=c[0],p=c[1];o[d]=wn.unescapeHTML(p)}}catch(t){r.e(t)}finally{r.f()}}return e}}])&&o(e.prototype,u),d&&o(e,d),v}(n.default.BootstrapTable)}));
diff --git a/cps/static/js/main.js b/cps/static/js/main.js
index 15bdfe25..988e3b9f 100644
--- a/cps/static/js/main.js
+++ b/cps/static/js/main.js
@@ -20,6 +20,15 @@ function getPath() {
     var jsFileLocation = $("script[src*=jquery]").attr("src");  // the js file path
     return jsFileLocation.substr(0, jsFileLocation.search("/static/js/libs/jquery.min.js"));  // the js folder path
 }
+
+function elementSorter(a, b) {
+    a = +a.slice(0, -2);
+    b = +b.slice(0, -2);
+    if (a > b) return 1;
+    if (a < b) return -1;
+    return 0;
+}
+
 // Generic control/related handler to show/hide fields based on a checkbox' value
 // e.g.
 //  <input type="checkbox" data-control="stuff-to-show">
@@ -712,3 +721,4 @@ $(function() {
         });
     });
 });
+
diff --git a/cps/static/js/table.js b/cps/static/js/table.js
index 1cef6dda..b2a95bc9 100644
--- a/cps/static/js/table.js
+++ b/cps/static/js/table.js
@@ -22,6 +22,26 @@ var selections = [];
 var reload = false;
 
 $(function() {
+    $('#tasktable').bootstrapTable({
+        formatNoMatches: function () {
+            return '';
+        },
+        striped: true
+    });
+    if ($('#tasktable').length) {
+        setInterval(function () {
+            $.ajax({
+                method: "get",
+                url: getPath() + "/ajax/emailstat",
+                async: true,
+                timeout: 900,
+                success: function (data) {
+                    $('#table').bootstrapTable("load", data);
+                }
+            });
+        }, 2000);
+    }
+
     $("#books-table").on("check.bs.table check-all.bs.table uncheck.bs.table uncheck-all.bs.table",
         function (e, rowsAfter, rowsBefore) {
             var rows = rowsAfter;
@@ -611,6 +631,7 @@ function checkboxFormatter(value, row){
     else
         return '<input type="checkbox" class="chk" data-pk="' + row.id + '" data-name="' + this.field + '" onchange="checkboxChange(this, ' + row.id + ', \'' + this.name + '\', ' + this.column + ')">';
 }
+
 function singlecheckboxFormatter(value, row){
     if(value)
         return '<input type="checkbox" class="chk" data-pk="' + row.id + '" data-name="' + this.field + '" checked onchange="checkboxChange(this, ' + row.id + ', \'' + this.name + '\', 0)">';
diff --git a/cps/templates/detail.html b/cps/templates/detail.html
index fe19cb6f..4a3d8f23 100644
--- a/cps/templates/detail.html
+++ b/cps/templates/detail.html
@@ -120,9 +120,8 @@
         </p>
         </div>
       {% endif %}
-
       {% if entry.series|length > 0 %}
-        <p>{{_("Book %(index)s of %(range)s", index=entry.series_index|formatfloat(2), range=("<a href='" + url_for('web.books_list', data='series', sort_param='stored', book_id=entry.series[0].id) + "'>" + entry.series[0].name + "</a>")|safe) }}</p>
+          <p>{{_("Book %(index)s of %(range)s", index=entry.series_index | formatfloat(2), range=(url_for('web.books_list', data='series', sort_param='stored', book_id=entry.series[0].id)|escapedlink(entry.series[0].name))|safe)}}</p>
 
       {% endif %}
 
diff --git a/cps/templates/index.html b/cps/templates/index.html
index b11500e4..dabcd8da 100644
--- a/cps/templates/index.html
+++ b/cps/templates/index.html
@@ -63,7 +63,7 @@
 </div>
 {% endif %}
 <div class="discover load-more">
-  <h2 class="{{title}}">{{_(title)}}</h2>
+  <h2 class="{{title}}">{{title}}</h2>
     <div class="filterheader hidden-xs hidden-sm">
       <a data-toggle="tooltip" title="{{_('Sort according to book date, newest first')}}" id="new" class="btn btn-primary" href="{{url_for('web.books_list', data=page, book_id=id, sort_param='new')}}"><span class="glyphicon glyphicon-book"></span> <span class="glyphicon glyphicon-calendar"></span><span class="glyphicon glyphicon-sort-by-order"></span></a>
       <a data-toggle="tooltip" title="{{_('Sort according to book date, oldest first')}}" id="old" class="btn btn-primary" href="{{url_for('web.books_list', data=page, book_id=id, sort_param='old')}}"><span class="glyphicon glyphicon-book"></span> <span class="glyphicon glyphicon-calendar"></span><span class="glyphicon glyphicon-sort-by-order-alt"></span></a>
diff --git a/cps/templates/tasks.html b/cps/templates/tasks.html
index 5cc15f87..c13ddff9 100644
--- a/cps/templates/tasks.html
+++ b/cps/templates/tasks.html
@@ -5,7 +5,7 @@
 {% block body %}
 <div class="discover">
     <h2>{{_('Tasks')}}</h2>
-    <table class="table table-no-bordered" id="table" data-url="{{  url_for('web.get_email_status_json') }}"  data-sort-name="starttime" data-sort-order="asc">
+    <table class="table table-no-bordered" id="tasktable" data-url="{{  url_for('web.get_email_status_json') }}"  data-sort-name="starttime" data-sort-order="asc">
       <thead>
         <tr>
             {% if g.user.role_admin() %}
@@ -25,32 +25,9 @@
 {% endblock %}
 {% block js %}
 <script src="{{ url_for('static', filename='js/libs/bootstrap-table/bootstrap-table.min.js') }}"></script>
-        <script>
-            // ToDo: Move to js file
-            $('#table').bootstrapTable({
-               formatNoMatches: function () {
-                return '';
-                },
-                striped: true
-            });
-            setInterval(function() {
-                $.ajax({
-                    method:"get",
-                    url: "{{ url_for('web.get_email_status_json')}}",
-                    async: true,
-                    timeout: 900,
-                    success:function(data){
-                    $('#table').bootstrapTable("load", data);
-                }
-                });
-            }, 1000);
-            function elementSorter(a, b) {
-                a = +a.slice(0, -2);
-                b = +b.slice(0, -2);
-                if (a > b) return 1;
-                if (a < b) return -1;
-                return 0;
-            }
-        </script>
+<script src="{{ url_for('static', filename='js/table.js') }}"></script>
+<script>
+    // ToDo: Move to js file
+</script>
 
 {% endblock %}
diff --git a/cps/ub.py b/cps/ub.py
index a5a6763b..f1a33d75 100644
--- a/cps/ub.py
+++ b/cps/ub.py
@@ -91,9 +91,9 @@ def store_user_session():
                 user_session = User_Sessions(flask_session.get('_user_id', ""), flask_session.get('_id', ""))
                 session.add(user_session)
                 session.commit()
-                log.info("Login and store session : " + flask_session.get('_id', ""))
+                log.debug("Login and store session : " + flask_session.get('_id', ""))
             else:
-                log.info("Found stored session : " + flask_session.get('_id', ""))
+                log.debug("Found stored session: " + flask_session.get('_id', ""))
         except (exc.OperationalError, exc.InvalidRequestError) as e:
             session.rollback()
             log.exception(e)
@@ -102,7 +102,7 @@ def store_user_session():
 
 def delete_user_session(user_id, session_key):
     try:
-        log.info("Deleted session_key : " + session_key)
+        log.debug("Deleted session_key: " + session_key)
         session.query(User_Sessions).filter(User_Sessions.user_id==user_id,
                                             User_Sessions.session_key==session_key).delete()
         session.commit()
diff --git a/optional-requirements.txt b/optional-requirements.txt
index 1fa84d50..af068a51 100644
--- a/optional-requirements.txt
+++ b/optional-requirements.txt
@@ -30,7 +30,6 @@ Flask-Dance>=2.0.0,<5.1.0
 SQLAlchemy-Utils>=0.33.5,<0.38.0
 
 # extracting metadata
-lxml>=3.8.0,<4.7.0
 rarfile>=2.7
 scholarly>=1.2.0, <1.3
 
diff --git a/requirements.txt b/requirements.txt
index b29d3b99..e7f67593 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,3 +12,4 @@ SQLAlchemy>=1.3.0,<1.5.0
 tornado>=4.1,<6.2
 Wand>=0.4.4,<0.7.0
 unidecode>=0.04.19,<1.3.0
+lxml>=3.8.0,<4.7.0