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CVE record · CVE-2026-70584

Windows Core Messaging Elevation of Privilege Vulnerability

CVSS 7.8 HighEPSS 0.0033 · 26th percentile

Published by the CVE Program (CNA: microsoft) at 8 Sept 2026, 17:12 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 Windows 10 Version 1607
  • affected 10.0.14393.0 to before 10.0.14393.9512 custom
Microsoft Windows 10 Version 1809
  • affected 10.0.17763.0 to before 10.0.17763.9245 custom
Microsoft Windows 10 Version 21H2
  • affected 10.0.19044.0 to before 10.0.19044.7725 custom
Microsoft Windows 10 Version 22H2
  • affected 10.0.19045.0 to before 10.0.19045.7725 custom
Microsoft Windows 11 version 23H2
  • affected 10.0.22631.0 to before 10.0.22631.7582 custom
Microsoft Windows 11 Version 23H2
  • affected 10.0.22631.0 to before 10.0.22631.7582 custom
Microsoft Windows 11 Version 24H2
  • affected 10.0.26100.0 to before 10.0.26100.9445 custom
Microsoft Windows 11 Version 25H2
  • affected 10.0.26200.0 to before 10.0.26200.9445 custom
Microsoft Windows 11 version 26H1
  • affected 10.0.28000.0 to before 10.0.28000.2954 custom
Microsoft Windows Server 2016
  • affected 10.0.14393.0 to before 10.0.14393.9512 custom
Microsoft Windows Server 2016 (Server Core installation)
  • affected 10.0.14393.0 to before 10.0.14393.9512 custom
Microsoft Windows Server 2019
  • affected 10.0.17763.0 to before 10.0.17763.9245 custom
Microsoft Windows Server 2019 (Server Core installation)
  • affected 10.0.17763.0 to before 10.0.17763.9245 custom
Microsoft Windows Server 2022
  • affected 10.0.20348.0 to before 10.0.20348.5622 custom
Microsoft Windows Server 2025
  • affected 10.0.26100.0 to before 10.0.26100.33438 custom
Microsoft Windows Server 2025 (Server Core installation)
  • affected 10.0.26100.0 to before 10.0.26100.33438 custom
Identifiers
CVE-2026-70584
CNA
microsoft
Weakness (CWE)
CWE-843
Tags
Published
8 Sept 2026
Updated
10 Nov 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Windows Core Messaging is affected in multiple Windows 10, Windows 11 and Windows Server 2016 builds before their listed fixed versions. A locally authorized attacker can exploit a type confusion flaw to elevate privileges. Upgrade to the fixed build for your version, such as 10.0.19045.7725 for Windows 10 22H2.

Written 11 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
7.8 High 3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.0033, the 26th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 8 Sept 2026, 17:12 UTC Confirmed by the CVE List
  2. 31 Oct 2026, 16:21 UTC First seen by agentprime

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.