The problem allows cross-site scripting attacks via websites. US-Cert said there are reported vulnerabilities in Flash (SWF) files that may allow a remote, unauthenticated attacker to conduct cross-site scripting attacks on a vulnerable system.
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The Flash file problem comes as US-Cert also reports there is exploit code in the wild to take advantage of a flaw in RealPlayer. The exploit reportedly affects RealPlayer 11 build 18.104.22.1688.
US-Cert will provide more information on this problem at a later date.