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TI-2026-47447 Aliases CVE-2026-66808GHSA-3hq7-6h7j-3wxc

Microsoft SharePoint Server Remote Code Execution Vulnerability

Priority MEDIUM 44CWE-502Published · 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, Red Hat and Microsoft. Impact type from Microsoft.

Summary

Deserialization of untrusted data 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 0.02044 81st percentileScored 2026-11-07
Fix Fixed Red Hat: 6 advisoriesMicrosoft: 5 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 SharePoint Enterprise Server 201616.0.0 to before 16.0.5565.100116.0.5565.1001Patch availableCNA
MicrosoftMicrosoft SharePoint Server 201916.0.0 to before 16.0.10417.2019816.0.10417.20198Patch availableCNA
MicrosoftMicrosoft SharePoint Server Subscription Edition16.0.0 to before 16.0.19725.2052216.0.19725.20522Patch availableCNA
  • Microsoft SharePoint Enterprise Server 2016 VendorMicrosoft Affected 16.0.0 to before 16.0.5565.1001 Fixed in 16.0.5565.1001 Patch available CNA
  • Microsoft SharePoint Server 2019 VendorMicrosoft Affected 16.0.0 to before 16.0.10417.20198 Fixed in 16.0.10417.20198 Patch available CNA
  • Microsoft SharePoint Server Subscription Edition VendorMicrosoft Affected 16.0.0 to before 16.0.19725.20522 Fixed in 16.0.19725.20522 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*before 16.0.19725.20522VulnerableMicrosoft
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_server:*:*:*:*:subscription:*:*:* Versions before 16.0.19725.20522 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

Red Hat 6 advisories

  • RHSA-2026:59593 Released 2026-08-25 · Red Hat rating Important
    multicluster engine for Kubernetes v2.17.2 security update
    • multicluster engine for Kubernetes 2.17 registry.redhat.io/multicluster-engine/cluster-api-provider-kubevirt-rhel9, registry.redhat.io/multicluster-engine/cluster-curator-controller-rhel9, registry.redhat.io/multicluster-engine/cluster-image-set-controller-rhel9 +6
  • RHSA-2026:59579 Released 2026-08-25 · Red Hat rating Important
    multicluster engine for Kubernetes v2.6.14 security update
    • multicluster engine for Kubernetes 2.6 registry.redhat.io/multicluster-engine/addon-manager-rhel9, registry.redhat.io/multicluster-engine/cluster-curator-controller-rhel9, registry.redhat.io/multicluster-engine/cluster-image-set-controller-rhel9 +17
  • RHSA-2026:59559 Released 2026-08-25 · Red Hat rating Important
    multicluster engine for Kubernetes v2.9.7 security update
    • multicluster engine for Kubernetes 2.9 registry.redhat.io/multicluster-engine/addon-manager-rhel9, registry.redhat.io/multicluster-engine/cluster-curator-controller-rhel9, registry.redhat.io/multicluster-engine/cluster-image-set-controller-rhel9 +15
Show 3 more Red Hat advisories
  • RHSA-2026:59558 Released 2026-08-25 · Red Hat rating Important
    multicluster engine for Kubernetes v2.8.10 security update
    • multicluster engine for Kubernetes 2.8 registry.redhat.io/multicluster-engine/addon-manager-rhel9, registry.redhat.io/multicluster-engine/backplane-rhel9-operator, registry.redhat.io/multicluster-engine/cluster-api-provider-agent-rhel9 +20
  • RHSA-2026:57194 Released 2026-08-19 · Red Hat rating Important
    multicluster engine for Kubernetes v2.11.5 security update
    • multicluster engine for Kubernetes 2.11 registry.redhat.io/multicluster-engine/addon-manager-rhel9, registry.redhat.io/multicluster-engine/backplane-rhel9-operator, registry.redhat.io/multicluster-engine/cluster-api-provider-kubevirt-rhel9 +11
  • RHSA-2026:54432 Released 2026-08-12 · Red Hat rating Important
    multicluster engine for Kubernetes v2.10.5 security update
    • multicluster engine for Kubernetes 2.10 registry.redhat.io/multicluster-engine/cluster-api-provider-kubevirt-rhel9, registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9, registry.redhat.io/multicluster-engine/console-mce-rhel9 +1

Microsoft 5 updates

  • KB5002906
    Security Update
    • Microsoft SharePoint Enterprise Server 2016 16.0.5565.1001
  • KB5002905
    Security Update
    • Microsoft SharePoint Enterprise Server 2016 16.0.5565.1001
  • KB5002896
    Security Update
    • Microsoft SharePoint Server 2019 16.0.10417.20198
Show 2 more Microsoft updates
  • KB5002894
    Security Update
    • Microsoft SharePoint Server 2019 16.0.10417.20198
  • KB5002893
    Security Update
    • Microsoft SharePoint Server Subscription Edition 16.0.19725.20522

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
multicluster engine for Kubernetes 2.10Fixed RHSA-2026:54432
multicluster engine for Kubernetes 2.11Fixed RHSA-2026:57194
multicluster engine for Kubernetes 2.17Fixed RHSA-2026:59593
multicluster engine for Kubernetes 2.6Fixed RHSA-2026:59579
multicluster engine for Kubernetes 2.8Fixed RHSA-2026:59558
multicluster engine for Kubernetes 2.9Fixed RHSA-2026:59559
Not affected: 6 products
  • multicluster engine for Kubernetes 2.10
  • multicluster engine for Kubernetes 2.11
  • multicluster engine for Kubernetes 2.17
  • multicluster engine for Kubernetes 2.6
  • multicluster engine for Kubernetes 2.8
  • multicluster engine for Kubernetes 2.9

Microsoft

Microsoft's page for this CVE →

Impact
Remote Code Execution
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-66808
  2. 2026-10-03 Alias added: GHSA-3hq7-6h7j-3wxc

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