EUVD-2026-31518
GHSA-w3mh-jmwv-56f3
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
1DescriptionNVD
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
AnalysisAI
Authenticated remote code execution in Microsoft SharePoint (Enterprise Server 2016, Server 2019, and Subscription Edition) stems from unsafe deserialization of untrusted data (CWE-502), enabling an authorized attacker to run arbitrary code on the server over the network. CVSS 8.8 with low privileges required and no user interaction makes this attractive to post-authentication adversaries, though no public exploit identified at time of analysis and CVSS temporal data marks exploit code maturity as Unproven.
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RemediationAI
24 hours: Identify and document all SharePoint 2016, 2019, and Subscription Edition installations; restrict network access to these systems pending patching where operationally feasible. 7 days: Deploy the vendor-released Microsoft SharePoint security patch to all identified systems in a controlled manner. …
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