Is my Joomla Site insecure?

[cepat]

Yes, i'm experiencing suddenly there are new user inside my joomla with administrator access. I'm using cpanel server and using imunify360 but it seems my joomla 3 inscure. I'm thinking to upgrade from joomla 3 to 4 version.

[toivo]

Welcome to the Joomla forum!

The security of the website depends on many factors, including the configuration of the server, if the third party extensions are uptodate and if the Joomla 3 CMS itself has been kept uptodate.

Please post the results from the Forum Post Assistant (FPA) by following the instructions at https://forumpostassistant.github.io/docs/ so that our volunteer Joomla and server experts can review the configuration.

[AMurray]

In the meantime, if you have concerns, try an audit/scan of your site with MySites.guru. It may find things that Immunify360 has let through or some other open-door (so to speak) that lets someone register with elevated privileges (just to be clear do you mean Administrator, or Super User - as there is a difference)

Upgrading to J4 may not solve the security issue if it is not found and as already suggested it may not be Joomla at fault, but a server config issue.

[Webdongle]

You will find instructions and download link for the fpa at https://forumpostassistant.github.io/docs/