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TI-2021-08235 Aliases CVE-2021-26418GHSA-h9wj-h268-pfrp

Microsoft SharePoint Server Spoofing Vulnerability

Priority LOW 34CWE-290Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-290.

Summary

Microsoft SharePoint Server Spoofing Vulnerability

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0124 69th percentileScored 2026-11-07
Fix Fixed Microsoft SharePoint Enterprise Server 2016 (Microsoft): 16.0.5161.1000Microsoft SharePoint Server 2019 (Microsoft): 16.0.10374.20000+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft SharePoint Enterprise Server 201616.0.0 to before 16.0.5161.100016.0.5161.1000Patch availableCNA
MicrosoftMicrosoft SharePoint Server 201916.0.0 to before 16.0.10374.2000016.0.10374.20000Patch availableCNA
MicrosoftMicrosoft SharePoint Foundation 2013 Service Pack 115.0.0 to before 15.0.5345.100015.0.5345.1000Patch availableCNA
  • Microsoft SharePoint Enterprise Server 2016 VendorMicrosoft Affected 16.0.0 to before 16.0.5161.1000 Fixed in 16.0.5161.1000 Patch available CNA
  • Microsoft SharePoint Server 2019 VendorMicrosoft Affected 16.0.0 to before 16.0.10374.20000 Fixed in 16.0.10374.20000 Patch available CNA
  • Microsoft SharePoint Foundation 2013 Service Pack 1 VendorMicrosoft Affected 15.0.0 to before 15.0.5345.1000 Fixed in 15.0.5345.1000 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:sharepoint_foundation:2013:sp1:*:*:*:*:*:*2013 sp1VulnerableMicrosoft
cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*2016VulnerableMicrosoft
cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*2019VulnerableMicrosoft
  • cpe:2.3:a:microsoft:sharepoint_foundation:2013:sp1:*:*:*:*:*:* Versions 2013 sp1 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:* Versions 2016 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:* Versions 2019 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Microsoft SharePoint Enterprise Server 2016 (Microsoft) Fixed in 16.0.5161.1000
  • Fix · CNA Microsoft SharePoint Server 2019 (Microsoft) Fixed in 16.0.10374.20000
  • Fix · CNA Microsoft SharePoint Foundation 2013 Service Pack 1 (Microsoft) Fixed in 15.0.5345.1000

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-26418
  2. 2026-10-03 Alias added: GHSA-h9wj-h268-pfrp

References

Patch 1

  • TI-2019-00394 Improper input validation in Microsoft SharePoint Server KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-08100 Microsoft Word Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2022-21993 Microsoft SharePoint Server Remote Code Execution Vulnerability CVSS 3.1HIGH 8.8
  • TI-2022-17767 Microsoft SharePoint Server Remote Code Execution Vulnerability CVSS 3.1HIGH 8.8
  • TI-2020-12940 Microsoft SharePoint Remote Code Execution Vulnerability CVSS 3.1HIGH 8.6
  • TI-2020-01145 A remote code execution vulnerability exists in Microsoft SharePoint Server when it fails… CVSS 3.1HIGH 8.8
See all 225 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences