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TI-2026-72949 Aliases CVE-2026-88166GHSA-94rr-7cq4-rj7c

Integer overflow in Microsoft SharePoint enables remote code execution

Priority MEDIUM 42CWE-121Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

Microsoft SharePoint Server Subscription Edition from 16.0.0 before 16.0.20326.20190 contains an integer overflow or wraparound flaw (CWE-190) that can be exploited to execute code. An authorized attacker with low privileges can execute code over a network without user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Integer overflow or wraparound in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00947 61st percentileScored 2026-11-07
Fix Fixed Microsoft SharePoint Server Subscription Edition (Microsoft): 16.0.20326.20190

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 SharePoint Server Subscription Edition16.0.0 to before 16.0.20326.2019016.0.20326.20190Patch availableCNA
  • Microsoft SharePoint Server Subscription Edition VendorMicrosoft Affected 16.0.0 to before 16.0.20326.20190 Fixed in 16.0.20326.20190 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*before 16.0.20326.20190VulnerableMicrosoft
  • cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:* Versions before 16.0.20326.20190 Vulnerable ·Microsoft

Remediation

Microsoft SharePoint Server Subscription Edition is fixed in 16.0.20326.20190. The sources list no advisory identifier for this fix.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Microsoft SharePoint Server Subscription Edition (Microsoft) Fixed in 16.0.20326.20190

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-88166
  2. 2026-10-13 Alias added: GHSA-94rr-7cq4-rj7c
  3. 2026-10-14 Priority changed: LOW → MEDIUM

References

Patch 1

  • TI-2026-42212 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-37256 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-16982 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-33671 Microsoft SharePoint Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-13749 Microsoft SharePoint Server Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-00394 Improper input validation in Microsoft SharePoint Server KEVCVSS 3.1CRITICAL 9.8
See all 631 →

Sources

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