- LP #491224: proper escaping of rendered error message

doc/CHANGES.rst

@@ -11,6 +11,8 @@ Zope 2.12.3 (unreleased)
 Bugs Fixed
 ++++++++++
 
+- LP #491224: proper escaping of rendered error message
+
 - LP #246983: Enabled unicode conflict resolution on variables inside "string:"
   expressions in TALES.
 

src/OFS/SimpleItem.py

@@ -51,6 +51,7 @@ from DocumentTemplate.ustr import ustr
 from ExtensionClass import Base
 from Persistence import Persistent
 from webdav.Resource import Resource
+from webdav.xmltools import escape as xml_escape
 from zExceptions import Redirect
 from zExceptions import upgradeException
 from zExceptions.ExceptionFormatter import format_exception