EUVD-2026-44072
GHSA-m2v2-8789-q639
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-reachable client bug with no attacker auth (PR:N) but victim must connect to a malicious RDP server (UI:R); UAF yields full RCE, so C/I/A all High.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft's Remote Desktop Client (the RDP client, mstsc.exe, shipped across Windows 10, Windows 11, and Windows Server 2012 through 2025) allows an unauthorized attacker to run arbitrary code over the network by triggering a use-after-free memory-corruption condition. Exploitation requires the victim to connect to an attacker-controlled or compromised RDP endpoint (UI:R), after which the malicious server can corrupt client-side memory to achieve full code execution. There is no public exploit identified at time of analysis and the CVE is not listed in CISA KEV; a vendor patch is available from Microsoft.
Technical ContextAI
The flaw is a CWE-416 Use-After-Free in the Windows Remote Desktop Client, the RDP client component (mstsc / mstscax) that speaks the Remote Desktop Protocol to RDP servers. A use-after-free occurs when the client continues to reference a heap object after it has been freed, allowing a malicious server to reclaim and control that memory, corrupt object state, and ultimately hijack execution flow. Per the affected CPE set, the vulnerable code is present in the RDP client stack of Windows 10 (1607, 1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2012 through 2025 including Server Core installations. Because the vulnerability lives in the client parser that processes server-supplied RDP data, the trust boundary is inverted from typical RDP concerns: here the server attacks the connecting client. Tags note both Memory Corruption and Denial Of Service as possible impacts of the same UAF.
RemediationAI
Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-50474 referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50474, selecting the update corresponding to each affected OS (Windows 10 1607/1809/21H2/22H2, Windows 11 24H2/25H2/26H1, and Windows Server 2012 through 2025 including Server Core); exact fixed build numbers are not provided in the input and should be taken from the MSRC page. As a compensating control until patched, restrict outbound RDP (TCP/UDP 3389) at the network egress to only known, trusted RDP servers so clients cannot connect to attacker-controlled endpoints - the side effect is that legitimate connections to new or external RDP hosts will break. Additionally, train users not to open .rdp files or click RDP links from untrusted sources and consider blocking .rdp file delivery via email, since the UI:R requirement means exploitation depends on the user initiating a connection; the trade-off is added friction for admins who legitimately share .rdp files.
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
Leaving vuln.today