EUVD-2026-56431
GHSA-r94x-x846-rxqx
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Authorized (PR:L) network-based code injection; impact scoped to spoofing per description aligns with I:H/C:L and no meaningful availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
7DescriptionNVD
Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
AnalysisAI
Code injection (CWE-94) in Microsoft SharePoint Server exposes authenticated network users to high-impact compromise across confidentiality, integrity, and availability on unpatched servers running SharePoint 2016 Enterprise, 2019, or Subscription Edition. The CVSS 8.8 rating (AV:N/AC:L/PR:L) reflects network exploitation requiring only low-privileged credentials, though the CVE description characterizes the primary effect as spoofing rather than full remote code execution - a tension that deserves verification against the Microsoft MSRC advisory. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network access to a Microsoft SharePoint Server instance running an unpatched build of SharePoint 2016 Enterprise (below 16.0.5565.1001), SharePoint 2019 (below 16.0.10417.20198), or SharePoint Subscription Edition (below 16.0.19725.20522). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) places this in the high-severity tier, with network exploitability at low authentication and full C/I/A impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary fix is to apply the vendor-released patches available through Microsoft's standard update mechanisms. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all SharePoint servers running versions 2016 Enterprise, 2019, or Subscription Edition using your asset management system, and confirm current patch levels through Microsoft's update documentation. …
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Same weakness CWE-94 – Code Injection
View allSame technique Code Injection
View allShare
External POC / Exploit Code
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