Just in addition to the Andre's answer, if you're using HSQL-db you can connect to the database using the DBVisualizer and so perform the procedure to restore the password to recover admin user rights, see below:
I hope this helps!
the only way (I think) is to get access to the database and set a new password for the admin user.
More Information about that topic can be read in the Confluence Documentation:
I don't know if there is any way to make that if you are using the hsql-db.
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