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CVE record · CVE-2026-56164

Microsoft SharePoint Server Elevation of Privilege Vulnerability

CVSS 5.3 MediumCriticalIn CISA KEVEPSS 0.010 · 63rd percentile

Critical, because:

  • In CISA’s KEV catalogue since 14 Jul 2026: it is known to be exploited.

How we decide what’s critical

Published by the CVE Program (CNA: microsoft) at 14 Jul 2026, 17:05 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Microsoft Microsoft SharePoint Enterprise Server 2016
  • affected 16.0.0 to before 16.0.5561.1001 custom
Microsoft Microsoft SharePoint Server 2019
  • affected 16.0.0 to before 16.0.10417.20175 custom
Microsoft Microsoft SharePoint Server Subscription Edition
  • affected 16.0.0 to before 16.0.19725.20434 custom
Identifiers
CVE-2026-56164
CNA
microsoft
Weakness (CWE)
CWE-306
Tags
Published
14 Jul 2026
Updated
1 Nov 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:F/RL:O/RC:C CNA (microsoft)
  • CISA KEV Listed since 14 Jul 2026: known to be exploited.
  • EPSS 0.010, the 63rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 14 Jul 2026, 17:05 UTC Confirmed by the CVE List

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.