Download Security Update for Microsoft .NET Framework 4.5 on Windows 7 Service Pack 1, and Windows Server 2008 R2 Service Pack 1, Windows Vista Service Pack 2, and Windows Server 2008 Service Pack 2 from Official Microsoft Download Center

Security Update for Microsoft .NET Framework 4.5 on Windows 7 Service Pack 1, and Windows Server 2008 R2 Service Pack 1, Windows Vista Service Pack 2, and Windows Server 2008 Service Pack 2

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A security issue has been identified that could allow an attacker to misrepresent a system action or behavior without the knowledge of the user.