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Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability

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

MANARTECH SECURITY ALERT

Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability

CVE Numbers

CVE-2026-56164

Affected Product

SharePoint Server — Microsoft

Threat Description

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

Severity Scale

CRITICALHIGHMEDIUMLOW

Severity

HIGH

Affected Versions

To be reviewed

Recommended Mitigation

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Reference Links