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Hubzilla Support ForumHi, just got a mail (to abuse@ and webmaster@) from an obscure site (openbounty.org)
"hub.netzgemeinde.eu Security Vulnerability Notification | OBB-697975 | Important"
Well, the site looks legitimate, but smells like a scam - and I've never ever heard about this in my professional life, so be careful. Just reported both mails as spam via spamcop.net.
(Edit) The guy might(!) have found something, at least he wrote to nearly all hubzilla nodes:
https://www.openbugbounty.org/researchers/deb_security/