CVE-2026-64921
Received Received - Intake

Authentication Bypass in Microsoft Office SharePoint

Publication date: 2026-08-11

Last updated on: 2026-08-11

Assigner: Microsoft Corporation

Description
Missing authentication for critical function in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

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Meta Information

Published
2026-08-11
Last Modified
2026-08-11
Generated
2026-08-11
AI Q&A
2026-08-11
EPSS Evaluated
N/A
NVD
CVE-2026-64921
EUVD
EUVD-2026-56722

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft office_sharepoint *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

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Executive Summary

This vulnerability is a missing authentication issue in Microsoft Office SharePoint that allows an authorized attacker to escalate their privileges over a network without proper validation.

Impact Analysis

An attacker could exploit this to gain higher access levels in SharePoint, potentially allowing them to view, modify, or delete sensitive data, or perform unauthorized actions within the system.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating compliance requirements for data protection and privacy such as GDPR or HIPAA, potentially resulting in legal penalties and reputational damage.

Mitigation Strategies

Apply the latest security updates from Microsoft for SharePoint as soon as possible to address the missing authentication issue. Monitor Microsoft's advisory for patches and follow their recommended mitigation steps.

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