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CISA lists this Microsoft vulnerability as known exploited. Its MSRC release detail is outside this installation's collected history.
Microsoft MSHTML engine contains an improper input validation vulnerability that allows for remote code execution vulnerability.
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Listed in CISA KEV · added 3 Nov 2021 · Microsoft · MSHTML
Microsoft MSHTML engine contains an improper input validation vulnerability that allows for remote code execution vulnerability.
No EPSS score is available here for this CVE.
Saved 23 Oct 2026 16:01:26 UTC · View this risk record (JSON)
A remote code execution vulnerability exists in the way that the MSHTML engine inproperly validates input, aka "MSHTML Engine Remote Code Execution Vulnerability." This affects Microsoft Office, Microsoft Office Word Viewer, Internet Explorer 9, Internet Explorer 11, Microsoft Excel Viewer, Internet Explorer 10, Office 365 ProPlus.
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