Xbox Live service alert for Modern Warfare 2

A service alert for Xbox Live has been issued, warning of "potential phishing attempts" in Call Of Duty: Modern Warfare 2 - although currently there is no interruption to services.
At time of press the service alert warns that: "Users may receive potential phishing attempts via title specific messaging while playing Modern Warfare 2.
We are aware of the problem and are working to resolve the issue. We apologise for any inconvenience this may cause and thank you for your patience."
The alert is only for the matchmaking element of Xbox Live, with no reported problems for the general service, Marketplace or accounts.
This may imply that attempts are being made to trick users into revealing personal or password information in-game, as part of the matchmaking process.
No further information is currently available from Microsoft or publisher Activision, but the alert comes as Sony is embroiled in the worst online security scandal so far experienced by the home console market.
http://www.gamesindustry.biz/article...dern-warfare-2