Description
Zero-click Remote Code Execution (RCE) via Outlook Preview Pane.
Required Action
Fix: Patch Office 2026/365. Workaround: Disable the Preview Pane.
References
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Frequently Asked Questions
What is CVE-2026-20953?
CVE-2026-20953 (Microsoft Office (January 2026)) is a vulnerability with a CVSS score of 8.4 (HIGH). Zero-click Remote Code Execution (RCE) via Outlook Preview Pane.
How do I fix CVE-2026-20953?
Patch Office 2026/365. Workaround: Disable the Preview Pane.
How severe is CVE-2026-20953?
CVE-2026-20953 has a CVSS score of 8.4, classified as HIGH. This vulnerability is in the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been actively exploited in the wild.
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