A high-severity vulnerability, identified as CVE-2025-54111, has been discovered in multiple products from the vendor Use. This flaw is a "Use After Free" memory corruption issue that, if exploited, allows an attacker who already has access to a system to elevate their privileges, potentially gaining full administrative control over the affected machine.

This vulnerability is a Use-After-Free condition within the Windows UI XAML Phone DatePickerFlyout component. A Use-After-Free flaw occurs when an application attempts to access a memory location after it has been deallocated, which can lead to unpredictable behavior, including crashes or arbitrary code execution. To exploit this, an attacker with existing local, low-privilege access would need to run a specially crafted application that interacts with the DatePickerFlyout UI element in a way that triggers the memory corruption. By carefully manipulating the system's memory state following the initial error, the attacker could execute arbitrary code with SYSTEM-level privileges.

This vulnerability is rated as High severity with a CVSS score of 7.8. Successful exploitation could lead to a complete compromise of the affected system. An attacker with standard user access could leverage this flaw to gain administrative control, allowing them to install malicious software such as ransomware or spyware, exfiltrate sensitive corporate data, disable security controls, and use the compromised machine as a staging point for further attacks across the network. The primary risk is the loss of confidentiality, integrity, and availability on any workstation or server where an attacker can gain an initial foothold.

Immediate Action: Apply the security updates provided by the vendor across all affected systems immediately. Prioritize patching on critical systems, such as servers and workstations used by privileged users. After patching, continue to monitor for any exploitation attempts and review system and application access logs for anomalous activity.

Proactive Monitoring: Security teams should actively monitor for indicators of compromise. This includes looking for unexpected crashes related to UI processes, suspicious process creation where a user-level process spawns a child process with elevated (SYSTEM) privileges, and alerts from Endpoint Detection and Response (EDR) solutions that detect memory corruption exploitation techniques.

Compensating Controls: If immediate patching is not feasible, implement compensating controls to reduce risk. Enforce the principle of least privilege to limit the capabilities of user accounts. Utilize application control or whitelisting solutions to prevent the execution of unauthorized code, which would block an attacker's payload. Ensure EDR tools are properly configured to detect and block common privilege escalation methods.

Public Exploit Available: false

Due to the high severity (CVSS 7.8) and the potential for a full system compromise, it is strongly recommended that organizations apply the vendor's security updates to all affected systems as a matter of priority. While this vulnerability is not yet known to be exploited in the wild, its nature as a local privilege escalation makes it a critical link in an attack chain for any adversary that has already gained initial access to a device. Patching should be treated as an urgent priority to prevent attackers from elevating their access and achieving objectives such as data theft or ransomware deployment.