CVE-2026-69518

CVE-2026-69518 is a heap-based buffer overflow (CWE-122) in the Remote Desktop component of Microsoft Windows, rated 8.8 (High) with a network attack vector and no privileges required. Exploitation involves crafted network traffic during a Remote Desktop session; the CVSS vector's user-interaction requirement (UI:R) indicates a user must initiate or accept the connection, consistent with the flaw being triggered in the RDP client when connecting to a malicious or compromised RDP server. A successful attacker gains remote code execution on the affected system, with high impact on confidentiality, integrity, and availability. All Windows systems running the affected Remote Desktop component are potentially exposed; the source data does not specify affected versions, so defenders should consult Microsoft's advisory for exact scope. There are currently no known exploits, no public proof-of-concept, no CISA KEV listing, and EPSS estimates a 0.8% probability of exploitation within 30 days (55th percentile).

What to do: Apply Microsoft's security update for CVE-2026-69518 as soon as it is published, prioritizing systems where users routinely use Remote Desktop or hosts exposed to untrusted networks. Until patched, avoid exposing RDP directly to the internet (restrict to VPN/gateway with Network Level Authentication) and disable the Remote Desktop client/feature where unneeded. Because the CVSS vector requires user interaction, also warn users against connecting to untrusted RDP servers and check Microsoft's advisory for the exact affected Windows editions and builds.