Windows Sensor Data Service EUVD-2026-56616

Exploitation requires the attacker to have a local interactive session or Remote Desktop access to the target system with at minimum a standard (low-privilege) user account - consistent with CVSS PR:L. The Windows Sensor Data Service must be in a running state; it is enabled by default on Windows 10 and Windows 11 consumer and enterprise editions and present on Windows Server 2022/2025. No special hardware sensor configuration or driver is confirmed as a prerequisite based on available data. Exploitation is bounded by the following limiting factors: (1) the attack is strictly local - no network-facing exploitation path is identified (AV:L); (2) the attacker must already have achieved some form of local code execution or interactive access; (3) SSVC Automatable:no confirms the attack cannot be scripted for mass propagation. Systems where interactive logon is restricted to administrators or where the Sensor Data Service is disabled are not exploitable via this vector.

The CVSS 7.8 (High) score is well-calibrated for this class of vulnerability. The local attack vector (AV:L) is the primary risk limiter - the flaw is not remotely exploitable over a network, constraining mass exploitation scenarios. However, the low privilege requirement (PR:L) means any standard domain or local user account is sufficient to attempt exploitation, which is significant in shared environments such as Remote Desktop Session Hosts, VDI farms, enterprise workstations, and kiosk deployments where privilege escalation from a compromised low-privilege account enables lateral movement. SSVC corroborates the CVSS assessment: exploitation status is confirmed as 'none' (no in-the-wild activity at time of analysis), automatable is 'no' (mass scanning or worm propagation is not feasible due to the local vector), and technical impact is 'total' (full CIA compromise of the local system). There is no tension between the CVSS vector and the textual description - both consistently describe a local privilege escalation. EPSS data was not provided in the input and cannot be assessed. No CISA KEV listing exists, reinforcing the SSVC exploitation:none finding. Real-world priority is elevated for organizations with high-value shared systems or where endpoint compromise scenarios are within threat model scope.

An attacker who has obtained a standard user account on a Windows endpoint - through phishing, credential stuffing, or as part of a post-initial-access lateral movement chain - sends a specially crafted input to the Windows Sensor Data Service's local interface, triggering the heap-based buffer overflow. The corrupted heap structures redirect code execution into attacker-controlled shellcode operating under the service's SYSTEM-level security context, granting full control of the local machine. No public exploit code has been identified at time of analysis; however, the low attack complexity (AC:L) indicates a working exploit would not require heap grooming, information leaks, or other multi-stage bypass techniques.