The latest version of Adobe Shockwave Player is 12.1.2.152.

Unfortunately, the release notes for Shockwave on the Adobe site haven’t been updated since 2007, so it’s difficult to know for sure what’s different about this version. However, given Adobe’s reputation, it’s safe to assume that running an older version of Shockwave will make your computer less secure.

Then again, since Shockwave apparently includes an old, unsecure version of Flash, you might want to consider removing Shockwave from your computer completely, unless you absolutely require it. Another alternative is to configure your browser to prompt for activation whenever Shockwave media is encountered. See the instructions for doing this in Firefox elsewhere on this site.