Summary
Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
Is the Preview Pane an attack vector for this vulnerability?
No, the Preview Pane is not an attack vector.
How could an attacker exploit this vulnerability?
An authenticated attacker with permission to contribute content to a SharePoint site could exploit missing authorization checks to gain administrative control of the farm's content database server. The attacker must be positioned on an adjacent network where authentication relaying is permitted. User interaction is not required.
Security updates
16.0.20326.20278 — https://support.microsoft.com/help/5002945
Vulnerabilities 1
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High 8.0
Microsoft Office SharePoint Elevation of Privilege Vulnerability
Missing authorization in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over an adjacent network.
Revision history
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#1
Information published.
References
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CVE-2026-109466 Microsoft Office SharePoint Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109466
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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