The YUI team reports:
Vulnerability in YUI 2.4.0 through YUI 2.9.0
A XSS vulnerability has been discovered in some YUI 2 .swf files from versions 2.4.0 through 2.9.0. This defect allows JavaScript injection exploits to be created against domains that host affected YUI .swf files.
If your site loads YUI 2 from a CDN (yui.yahooapis.com, ajax.googleapis.com, etc.) and not from your own domain, you are not affected. YUI 3 is not affected by this issue.
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If you have found a vulnerability in a FreeBSD port not listed in the database, please contact the FreeBSD Security Team. Refer to "FreeBSD Security Information" for more information.