If you’re self hosting roundcube be sure to update.
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I’m not surprised. A cube can’t be round. That’s an obvious design flaw.
It’s only if you view a specifically crafted email in the web client… still worth upgrading of course.
Only? “Viewing emails in a web browser” is the entire point of roundcube. It’s trivial to send out millions of “specially created emails” looking for a victim.
