How can I safely revert to earlier version of CiviCRM without reverting the database?
There are no database changes between the 5.10 versions so you can switch the code back &amp; forth without issue - however you will lose the security patches, making your site vulnerable - which is not great since the SAs have been published - it might be you do that temporarily but prioritise getting the extension fixed. If you tighten the permission on accessing uploaded files it will mitigate the security issue - does the extension use uploaded files &amp; images?