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Do I need to upgrade my PHP on each of the servers running XOOPS/newBB or don't they use unserialize()? It's a flaw within the function unserialize() that is rated as very critical for millions of PHP servers, because it is exposed to remote attackers through lots of very popular webapplications. The list includes forum software like phpBB2, WBB2, Invision Board and vBulletin.