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TI-2026-16964 Aliases CVE-2026-20943GHSA-7mcc-vv62-fp9q

Microsoft Office Click-To-Run Remote Code Execution Vulnerability

Priority LOW 34CWE-426Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Microsoft. Impact type from Microsoft.

Summary

Untrusted search path in Microsoft Office allows an unauthorized attacker to execute code locally.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00646 51st percentileScored 2026-11-07
Fix Fixed Microsoft: 4 updates

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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 Office 201616.0.0 to before 16.0.5535.100016.0.5535.1000Patch availableCNA
MicrosoftMicrosoft Office Deployment Tool1.0 to before 16.0.19426.2017016.0.19426.20170Patch availableCNA
MicrosoftMicrosoft SharePoint Enterprise Server 201616.0.0 to before 16.0.5535.100116.0.5535.1001Patch availableCNA
MicrosoftMicrosoft SharePoint Server 201916.0.0 to before 16.0.10417.2008316.0.10417.20083Patch availableCNA
MicrosoftMicrosoft SharePoint Server Subscription Edition16.0.0 to before 16.0.19127.2044216.0.19127.20442Patch availableCNA
  • Microsoft Office 2016 VendorMicrosoft Affected 16.0.0 to before 16.0.5535.1000 Fixed in 16.0.5535.1000 Patch available CNA
  • Microsoft Office Deployment Tool VendorMicrosoft Affected 1.0 to before 16.0.19426.20170 Fixed in 16.0.19426.20170 Patch available CNA
  • Microsoft SharePoint Enterprise Server 2016 VendorMicrosoft Affected 16.0.0 to before 16.0.5535.1001 Fixed in 16.0.5535.1001 Patch available CNA
  • Microsoft SharePoint Server 2019 VendorMicrosoft Affected 16.0.0 to before 16.0.10417.20083 Fixed in 16.0.10417.20083 Patch available CNA
  • Microsoft SharePoint Server Subscription Edition VendorMicrosoft Affected 16.0.0 to before 16.0.19127.20442 Fixed in 16.0.19127.20442 Patch available CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x64:*2016VulnerableMicrosoft
cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x86:*2016VulnerableMicrosoft
cpe:2.3:a:microsoft:office_deployment_tool:*:*:*:*:*:*:*:*before 16.0.19426.20170VulnerableMicrosoft
cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*before 16.0.19127.20442VulnerableMicrosoft
cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*2016VulnerableMicrosoft
cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*2019VulnerableMicrosoft
  • cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x64:* Versions 2016 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x86:* Versions 2016 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:office_deployment_tool:*:*:*:*:*:*:*:* Versions before 16.0.19426.20170 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:* Versions before 16.0.19127.20442 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

Microsoft 4 updates

  • KB5002828
    Security Update
    • Microsoft SharePoint Enterprise Server 2016 16.0.5535.1001
  • KB5002826
    Security Update
    • Microsoft Office 2016 (32-bit edition) 16.0.5535.1000
    • Microsoft Office 2016 (64-bit edition) 16.0.5535.1000
  • KB5002825
    Security Update
    • Microsoft SharePoint Server 2019 16.0.10417.20083
Show 1 more Microsoft updates
  • KB5002822
    Security Update
    • Microsoft SharePoint Server Subscription Edition 16.0.19127.20442

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Remote Code Execution
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
ProductStatusPlan or fix
Microsoft Office Deployment ToolFixed 16.0.19426.20170 · Security Update

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-20943
  2. 2026-10-03 Alias added: GHSA-7mcc-vv62-fp9q
  3. 2026-10-07 EPSS moved to the 50th–90th percentile
  4. 2026-10-09 EPSS moved to the below the 50th percentile
  5. 2026-10-14 EPSS moved to the 50th–90th percentile
  6. 2026-10-18 EPSS moved to the below the 50th percentile
  7. 2026-10-19 EPSS moved to the 50th–90th percentile

References

Patch 1

  • TI-2023-09240 Microsoft Outlook Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-01013 A remote code execution vulnerability exists in Microsoft Excel software when the… KEVCVSS 3.1HIGH 8.8
  • TI-2019-00335 Command injection in Microsoft Office KEVCVSS 3.1HIGH 8.8
  • TI-2018-00739 Out-of-bounds write in Microsoft Equation Editor KEVCVSS 3.1HIGH 8.8
  • TI-2015-02130 Microsoft PowerPoint 2007 SP3, Word 2007 SP3, PowerPoint 2010 SP2, Word 2010 SP2… KEVCVSS 3.1HIGH 8.8
  • TI-2015-01588 Microsoft Office 2013 SP1 and 2013 RT SP1 allows remote attackers to execute arbitrary… KEVCVSS 3.1HIGH 8.8
See all 1024 →

Sources

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