by Kastro
Paper/Archive/CVE-2026-54990

CVE-2026-54990

Microsoft Windows 11 Version 24H2 — Remote Desktop Client Remote Code Execution Vulnerability

EPSS 0.8%CVSS 9.8
critical.is priorityof 100
41
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 57.1.571 × 2011.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

Affected

ProductAffectedFixed inSource
Windows 11 Version 24H210.0.26100.0 – < 10.0.26100.887510.0.26100.8875CNA
Windows 11 Version 25H210.0.26200.0 – < 10.0.26200.887510.0.26200.8875CNA
Windows 11 version 26H110.0.28000.0 – < 10.0.28000.252510.0.28000.2525CNA
Windows Server 202510.0.26100.0 – < 10.0.26100.3315810.0.26100.33158CNA
Windows Server 2025 (Server Core installation)10.0.26100.0 – < 10.0.26100.3315810.0.26100.33158CNA

Scores by source

microsoft (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

patchmsrc.microsoft.com/update-guide/vulnerability/CVE-2026-54990