Summary
Impact: Information Disclosure. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
What type of information could be disclosed by this vulnerability?
An authenticated user could access information indexed from SharePoint content outside the sites they are authorized to read. This is disclosure through the affected search index, not unrestricted access to every file on the server.
Is the Preview Pane an attack vector for this vulnerability?
No, the Preview Pane is not an attack vector.
Security updates
16.0.20326.20278 — https://support.microsoft.com/help/5002945
Vulnerabilities 1
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Medium 6.5
Microsoft Office SharePoint Information Disclosure Vulnerability
Incorrect authorization in Microsoft Office SharePoint allows an authorized attacker to disclose information over a network.
Revision history
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#1
Information published.
References
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CVE-2026-109455 Microsoft Office SharePoint Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109455
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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