I asked this exact same question on Perl Programmers Facebook group, and Will Braswell gave a really good answer. He suggested using ShinyCMS.
https://github.com/denny/ShinyCMS

Source: https://www.facebook.com/groups/perlprogrammers/posts/9595000193866016/

In reply to Re: Web user account module? by harangzsolt33
in thread Web user account module? by Yidd

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