It looks like a gumblar attack. Change all the passwords and then check the server space for any suspicious files. Then upgrade your forum to the lastest version, be that of the 3x series or 4.0.3. And as last but not least contact your host and let them know about it so they can check their logs as well and see how they got in (in the chance that it is not a gumblar atatck), so the security issues can be patched up.
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