I thought I asked this already but guess not! I didn't want to go through the hassle of migrating my site to 2.5, so I simply installed and populated a fresh version template on a subdomain with redirect via htaccess to reflect the new path. BUT now I'm nervous about whether it's a security risk? I can still access my old site/administrator easily... and that's a 1.5.
The reason why I didn't want to migrate is because I have several sites shared/wrapped within my public_html.
What do you think? Am I safe, or how can I be safer?? thx..d.
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As long as your 1.5 site is running 1.5.26 (and stays up to date) and all the extensions are up-to-date, you should generally be OK. At the very least, your 1.5 site is not any less secure than it was previously.
I would, however, recommend getting rid of any old sites if/when you're no longer using them. This is simply because you might forget to keep them up to date and also because having one extra site is one extra target.