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CVE-2026-47635 is a Critical remote code execution vulnerability in Microsoft Office affecting Microsoft Outlook and Microsoft Word. Microsoft describes it as an access-of-resource-using-incompatible-type issue (type confusion). Supporting content indicates the flaw is in the Word rendering/document parsing pipeline used by Outlook Classic to render email content, including in the Preview Pane. A specially crafted email body, attachment, or document can cause the Word engine to interpret attacker-controlled data as a valid object or pointer, leading to memory corruption and ultimately arbitrary code execution. Although Microsoft’s CVSS vector is local (AV:L), the attack can be initiated remotely by delivering malicious content that is then processed locally by Office; the Outlook Classic Preview Pane is explicitly identified as a valid trigger path.
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A critical remote code execution vulnerability caused by a heap-based buffer overflow in the Microsoft Word rendering engine, affecting Outlook and Word via email/document rendering, including the Outlook Preview Pane.
A critical remote code execution vulnerability in Microsoft Outlook and Word caused by type confusion in the Word rendering engine/document parsing pipeline.
Critical Outlook and Word remote code execution vulnerability with a Preview Pane attack vector, highlighted for prioritization.
A critical type confusion remote code execution vulnerability in Microsoft Office exploitable via the Outlook Classic preview pane.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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