Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An attacker could provide specially crafted files and convince a user to first open an HTML file, then open a Word document in the same running instance of Word and save that document as a web page. Successful exploitation could allow the attacker to execute code with the user's permissions. The attacker does not need an account on the affected system.
Is the Preview Pane an attack vector for this vulnerability?
No, the Preview Pane is not an attack vector.
Security updates
https — https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates
16.115.26110837 — https://learn.microsoft.com/en-us/officeupdates/release-notes-office-for-mac
16.0.14334.21048 — https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates
Vulnerabilities 1
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High 8.8
Microsoft Office Word Remote Code Execution Vulnerability
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
Revision history
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#1
Information published.
References
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CVE-2026-111298 Microsoft Office Word Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111298
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss