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Microsoft issued a warning to Windows users on Tuesday that attackers are actively exploiting an unpatched remote execution zero-day vulnerability in MSHTML, a proprietary browser engine for the now-discontinued Internet Explorer using weaponized MS Office documents.
Tracked as CVE-2021-40444, the vulnerability affects Windows Server 2008 through 2019 and Windows 8.1 through 10 and has a severity level of 8.8 out of the maximum 10.
“Microsoft is investigating reports of a remote code execution vulnerability in MSHTML that affects Microsoft Windows. Microsoft is aware of targeted attacks that attempt to exploit this vulnerability by using specially-crafted Microsoft Office documents,” the company said in a security advisory.
“An attacker could craft a malicious ActiveX control to be used by a Microsoft Office document that hosts the browser rendering engine. The attacker would then have to convince the user to open the malicious document. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights,” it added.
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Read the original article: Microsoft Office Users Targeted in a New Zero-Day Attack