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CVE record · CVE-2026-54990

Remote Desktop Client Remote Code Execution Vulnerability

CVSS 9.8 CriticalCriticalEPSS 0.0082 · 57th percentile

Critical, because:

  • CVSS score 9.8: 9.0 or more.

How we decide what’s critical

Published by the CVE Program (CNA: microsoft) at 14 Jul 2026, 17:04 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 11 Version 24H2
  • affected 10.0.26100.0 to before 10.0.26100.8875 custom
Microsoft Windows 11 Version 25H2
  • affected 10.0.26200.0 to before 10.0.26200.8875 custom
Microsoft Windows 11 version 26H1
  • affected 10.0.28000.0 to before 10.0.28000.2525 custom
Microsoft Windows Server 2025
  • affected 10.0.26100.0 to before 10.0.26100.33158 custom
Microsoft Windows Server 2025 (Server Core installation)
  • affected 10.0.26100.0 to before 10.0.26100.33158 custom
Identifiers
CVE-2026-54990
CNA
microsoft
Weakness (CWE)
CWE-122
Tags
Published
14 Jul 2026
Updated
10 Nov 2026

Machine-written summary

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

Remote Desktop Client in Microsoft Windows 11 versions 24H2, 25H2 and 26H1 and in Windows Server 2025 (including Server Core installations) is affected before the builds listed in the advisory. A heap-based buffer overflow lets an unauthorized attacker execute code over a network. Upgrade to Windows 11 24H2 build 10.0.26100.8875, 25H2 build 10.0.26200.8875, 26H1 build 10.0.28000.2525, or Windows Server 2025 build 10.0.26100.33158 or later.

Written 13 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:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.0082, the 57th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 14 Jul 2026, 17:04 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.