Adobe has provided an update to resolve vulnerabilities in Adobe Flash Player. These vulnerabilities would allow remote attackers to modify HTTP headers of client requests and conduct HTTP Request Splitting attacks. The flexibility of the attack varies depending on the type of web browser being used.
Apparently, Flash Player 7, 8, and 9 are all affected, but there is only an update available for version 9 at the moment. I should also note that the fix has been marked as "Important," which is one step below their highest severity level of "Critical," so definitely look into upgrading if possible.
For any Flash or Flex developers who rely on the Debug version of the player for development, Adobe unfortunately makes it hard to find the updated Players on their site, so here you go.