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CVE record · CVE-2026-58644

Microsoft SharePoint Remote Code Execution Vulnerability

CVSS 9.8 CriticalCriticalIn CISA KEVEPSS 0.16 · 96th percentile

Critical, because:

  • In CISA’s KEV catalogue since 16 Jul 2026: it is known to be exploited.
  • CVSS score 9.8: 9.0 or more.
  • CVSS score 9.8 (7.0 or more) and EPSS 0.16 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

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 16.0.5556.1005 custom
Microsoft Microsoft SharePoint Server 2019
  • affected 16.0.0 to before 16.0.10417.20153 custom
Microsoft Microsoft SharePoint Server Subscription Edition
  • affected 16.0.0 to before 16.0.19725.20384 custom
Identifiers
CVE-2026-58644
CNA
microsoft
Weakness (CWE)
CWE-502
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
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C CNA (microsoft)
  • CISA KEV Listed since 16 Jul 2026: known to be exploited.
  • EPSS 0.16, the 96th 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.