Microsoft has released Microsoft security advisory 2501696 indicating that it is investigating public reports of a vulnerability affecting Windows. This vulnerability is due to the way MHTML interprets MIME-formatted requests for content blocks within a document. Exploitation of this vulnerability may allow an attacker to obtain sensitive information.
US-CERT encourages users and administrators to review Microsoft security advisory 2501696 and implement the suggested workarounds or utilize Microsoft Fix it 50602 to help mitigate the risks. Additional information regarding this vulnerability can be found on the Microsoft TechNet Security Research & Defense blog.