![]() ![]() He also outlined some of the side-effects of these updates: Pages are now required to be whitelisted using entries in the web.config autoeventwireup, enablesessionstate, serverside event receivers for page actiona) are blocked. Declarative Statements in Pages and Master Pages which invoke server side code (e.g. ![]() Pages which require that have to be whitelisted explicitly using entries in the web.config Inline Code Blocks in Pages are blocked.Custom Server Controls need to be explicitly registered as safe in the web.config using entries.Custom User Controls (ascx) need to be explicitly registered as safe in the web.config using entries.Code Behind Classes and Web Parts need to be explicitly registered as safe in the web.config using entries. ![]() Stefan Goßner, from Microsoft outlined these changes: The changes being applied are to do with items such as Safe Control entries, Custom User Controls, P age Parser Paths and any Declarative Statements in Master Pages and Pages ( always advise against this anyway). An example of first party applications are: Microsoft Identity Manager (MIM) portal pages and Dynamics AX, along with other components. Some of these security fixes have tightened the security requirements for this. ![]() The main problem is found with any SharePoint environments that are integrated with first and third party solutions. That is not really a fair statement, as the changes are actually what was intended to be added. As has happened in the past ( just a few times), we are seeing multiple issues with this update. Hopefully you are not in the same boat as some organizations, who have applied the SharePoint 2010, 2013, 2016 or 2019 September 2020 Cumulative Update. ![]()
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