There is a critical security bug in Adobe's Shockwave software
and everyone with Shockwave installed should upgrade to the latest version.
Shockwave versions up to and including 188.8.131.522 are buggy, version 184.108.40.2066 is the latest and greatest. This problem affects both Macs and Windows according to Adobe.
Rather than dig into your operating system to see if Shockwave is installed, Adobe has a Shockwave tester page
that reports on the installed version of Shockwave, if any.
If Shockwave is not
installed, the results on this page vary depending on your web browser.