CVE-2026-56164 | BDVDB-2026-348369 Detail

MicrosoftMicrosoft SharePoint Enterprise Server 2016

Description#

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

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact low, availability impact none. Attack vector: network.

Weaknesses#

CWE-306 Missing Authentication for Critical Function

References#

Exploit#

No public exploit known

History#

Version 12026-07-14Record published in the CVE List.
Version 22026-11-10Most recent update recorded in the CVE List.

Published

Published: 2026-07-14
Last modified: 2026-11-10

Vendor information

Vendor: Microsoft
Product: Microsoft SharePoint Enterprise Server 2016

All Microsoft vulnerabilities

Score

5.3 Medium

EPSS

1.0%, Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 63.5.

KEV

Yes

Listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Authentication Issues

Action

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.

Affected Systems

Vulnerable
>= 16.0.0 and < 16.0.5561.1001
Fixed
16.0.5561.1001

Scoring System

CVSS v4.0

Not available

CVSS v3.1

5.3 Medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:F/RL:O/RC:C

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	Low
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).