Type Confusion RCE in Microsoft Office
CVE-2026-26110 is a critical Microsoft Office vulnerability caused by access of a resource using an incompatible type (type confusion). Microsoft and multiple supporting reports describe the flaw as enabling code execution locally, with the issue affecting Microsoft Office across Windows, macOS, and Android, including Office 2016, Office 2019, Microsoft 365 Apps for Enterprise, Office LTSC 2021/2024, and Office for Android. The vulnerability is associated with CVSS v3.1 vector AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H and a base score of 8.4. Available reporting indicates the flaw can be triggered by a malicious Office document and that the Windows File Explorer or Office/Outlook Preview Pane is a viable attack vector, meaning code execution may occur when the victim merely previews the malicious content rather than fully opening it. The underlying memory-safety issue can result in improper type handling and unintended memory access, leading to arbitrary code execution in the context of the affected application.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
29 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).
The version that knows your environment.
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.