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CVE-2026-45456 is a critical type confusion vulnerability in Microsoft Office affecting Microsoft Outlook and Microsoft Word. The flaw is described as access of a resource using an incompatible type in the Office document parsing and Word rendering pipeline. Outlook Classic uses the Word rendering engine to process and display email content, including content shown in the Preview Pane, making that rendering path a viable trigger surface. A specially crafted email body, Office-rendered content, or malicious document can cause the Word engine to interpret attacker-controlled data as an object or pointer of an incompatible type, resulting in memory corruption and potential arbitrary code execution in the context of the victim user.
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A critical remote code execution vulnerability caused by type confusion 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 working Preview Pane attack vector, making it high priority for patching.
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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