Re: SECURITY WARNING: stop using Private Messaging plugin
Technically the plugin has been abandoned by the original author.
I don’t think the download can be disabled but Sam or Michael might be able to move it on the SVN from the trunk directory to a tag where the extend section would make a link that would fail to download so that would prevent people from blindly installing it.
The plugin was written after bbPress .7 had just updated to .8 so there were few other plugins available for the author to model some security against. It’s design is a little dated and spread out across several files makes it hard to maintain (a similar problem that the avatar upload plugin shares).