It's possible to activate the directory through database providing you're unable to access using any admin account in Confluence. Here's the documentation on how to retrieve the password: https://confluence.atlassian.com/display/DOC/Restoring+Passwords+To+Recover+Admin+User+Rights
As for making the internal directory active, check out the step 5 under "Put Internal Directory in First Position" section of the page which has the sql query to do so. Make sure you backup your database before any modification in database.
Two vulnerabilities have been published for Confluence Server and Data Center recently: March 20, 2019 CVE-2019-3395 / CVE-2019-3396 April 17, 2019 CVE-2019-3398 The goal of this article is...
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