Wagtail vulnerable to stored Cross-site Scripting attack via ModelAdmin views

from django import forms
from django.utils.translation import gettext as _
from wagtail.contrib.modeladmin.views import ChooseParentView
from wagtail.contrib.modeladmin.forms import ParentChooserForm


class PatchedPageChoiceField(forms.ModelChoiceField):
    """PageChoiceField with plain-text breadcrumbs to patch stored XSS."""
    def label_from_instance(self, obj):
        bits = []
        for ancestor in (
            obj.get_ancestors(inclusive=True).exclude(depth=1).specific(defer=True)
        ):
            bits.append(ancestor.get_admin_display_title())
        return ' | '.join(bits)


class PatchedParentChooserForm(ParentChooserForm):
    """ParentChooserForm with custom parent_page to patch stored XSS."""
    parent_page = PatchedPageChoiceField(
        label=_("Parent page"),
        required=True,
        empty_label=None,
        queryset=Page.objects.none(),
        widget=forms.RadioSelect(),
    )


class PatchedChooseParentView(ChooseParentView):
    """ChooseParentView with custom get_form patch stored XSS."""
    def get_form(self, request):
        parents = self.permission_helper.get_valid_parent_pages(request.user)
        return PatchedParentChooserForm(parents, request.POST or None)

from django.template.defaultfilters import filesizeformat
from django.utils.html import format_html
from wagtail.contrib.modeladmin.views import InspectView


class PatchedInspectView(InspectView):
    """InspectView with override to patch stored XSS vulnerability."""
    def get_document_field_display(self, field_name, field):
        """Render a link to a document"""
        document = getattr(self.instance, field_name)
        if document:
            return format_html(
                '<a href="{}">{} <span class="meta">({}, {})</span></a>',
                document.url,
                document.title,
                document.file_extension.upper(),
                filesizeformat(document.file.size),
            )
        return self.model_admin.get_empty_value_display(field_name)