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CVE-2026-26110 is a critical remote code execution vulnerability in Microsoft Office caused by type confusion when the software accesses a resource using an incompatible type. Improper type handling can lead to invalid memory access and unintended control over program execution, enabling arbitrary code execution in the context of the affected Office application. The vulnerability affects multiple Microsoft Office product lines, including perpetual, LTSC, Microsoft 365 Apps for Enterprise, macOS editions, and Office for Android. A notable attack vector is content rendering through the Preview Pane, where specially crafted malicious Office content can trigger exploitation during preview rather than requiring the user to fully open the document.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
31 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft Office type-confusion vulnerability that can lead to code execution (described as RCE/ACE), including via Windows Explorer Preview Pane rendering of a malicious document.
A critical remote code execution vulnerability in Microsoft Office that can be triggered by viewing a malicious message in the Preview Pane.
A critical remote code execution vulnerability in Microsoft Office that can be triggered by viewing a malicious message in the Preview Pane.
Microsoft Office remote code execution triggered by viewing a malicious document in the Preview Pane (memory handling issue).
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.