Microsoft SharePoint Server Remote Code Execution Vulnerability

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Summary

CVECVE-2026-40368
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-12 18:17:15 UTC
Updated2026-05-12 18:17:15 UTC
DescriptionDeserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Risk And Classification

Primary CVSS: v3.1 8 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Problem Types: CWE-502 | CWE-502 CWE-502: Deserialization of Untrusted Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
3.1CNACVSS8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft Microsoft SharePoint Enterprise Server 2016 affected 16.0.0 16.0.5552.1002 custom x64-based Systems
CNA Microsoft Microsoft SharePoint Server 2019 affected 16.0.0 16.0.10417.20128 custom x64-based Systems
CNA Microsoft Microsoft SharePoint Server Subscription Edition affected 16.0.0 16.0.19725.20280 custom x64-based Systems

References

ReferenceSourceLinkTags
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40368 [email protected] msrc.microsoft.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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