Is it possible to find out who installed an extension update?
The extension wouldn't update itself.

If you have Detailed Logging enabled, you should be able to figure out who updated it by checking log_user_id in log_civicrm_extension.  If you don't have that:


Check the "last action" times in the Drupal "Users" list.  Is there only one person who was active?  Great!
Check your web server logs for the URL that updates the extension - something like https://mysite.org/civicrm/admin/extensions?action=update&amp;id=net.ourpowerbase.sumfields&amp;key=net.ourpowerbase.sumfields


You should be able to get an IP address, which, depending on whether folks access the site from one IP or not, should be able to give you your answer.