On behalf of Zope developer community I am pleased to announce the release of 
Zope 5.11.1 with several security fixes.

This bugfix release relies on waitress version 3.0.1. Version 3.0.0 suffers 
from two exploits, see 
https://github.com/Pylons/waitress/security/advisories/GHSA-9298-4cf8-g4wj and 
https://github.com/Pylons/waitress/security/advisories/GHSA-3f84-rpwh-47g6. If 
you cannot upgrade your installation to Zope 5.11.1 it is sufficient to upgrade 
waitress to version 3.0.1 as a workaround.

AccessControl has been updated to release 7.2. Earlier versions suffer from a 
security issue where anonymous users could delete all users stored in a 
standard Zope user folder. Only the standard user folder is affected, most 
deployments such as those using Plone do not use this standard user folder and 
are not affected. If you cannot upgrade your installation to Zope 5.11.1 it is 
sufficient to upgrade AccessControl to version 7.2 as a workaround.

For details of the changes see 
https://zope.readthedocs.io/en/latest/changes.html

To install the new version see 
https://zope.readthedocs.io/en/latest/INSTALL.html

Jens Vagelpohl

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