Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
An attacker must send a user a malicious Office file and convince them to open it.
Security updates
https — https://docs.microsoft.com/en-us/officeupdates/office365-proplus-security-updates
Vulnerabilities 1
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High 7.8
Microsoft Office Outlook Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code locally.
Revision history
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#4
Updated one or more CVSS scores for the affected products. This is an informational change only.
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#3
CWE added. Informational change only.
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#1
Information published.
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#2
Information published. This CVE was addressed by updates that were released in September 2026, but the CVE was inadvertently omitted from the September 2026 Security Updates. This is an informational change only. Customers who have already installed the September 2026 updates do not need to take any further action.
References
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CVE-2026-70125 Microsoft Office Outlook Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70125
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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