CVE-2025-55690 is a use-after-free vulnerability identified in the Windows PrintWorkflowUserSvc service, a component responsible for managing print workflows in Microsoft Windows 11 Version 24H2 (build 10.0.26100.0). The vulnerability arises when the service improperly handles memory, freeing an object while it is still in use, leading to potential exploitation by an attacker. An authorized attacker with low privileges on the local system can exploit this flaw to elevate their privileges, potentially gaining SYSTEM-level access. The vulnerability has a CVSS v3.1 base score of 7.0, indicating high severity, with the vector indicating local attack vector (AV:L), high attack complexity (AC:H), low privileges required (PR:L), no user interaction (UI:N), unchanged scope (S:U), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H). The exploitability is limited by the need for local access and the complexity of triggering the use-after-free condition. No public exploits or patches are currently available, but the vulnerability is publicly disclosed and assigned a CVE ID. The flaw is categorized under CWE-416 (Use After Free), a common memory corruption issue that can lead to arbitrary code execution or system compromise. This vulnerability specifically targets the print workflow service, which is a critical component in Windows print management, making it a valuable target for attackers seeking privilege escalation on Windows 11 systems.

The impact of CVE-2025-55690 is significant for organizations running Windows 11 Version 24H2, as it enables local attackers with limited privileges to escalate their rights to SYSTEM level. This can lead to full system compromise, including unauthorized access to sensitive data, modification or deletion of critical files, installation of persistent malware, and disruption of system availability. In enterprise environments, such privilege escalation can facilitate lateral movement, persistence, and further exploitation of network resources. The vulnerability's exploitation does not require user interaction, increasing the risk of automated or stealthy attacks once local access is obtained. Although no exploits are known in the wild yet, the public disclosure increases the risk of future exploitation. Organizations relying heavily on Windows 11 for endpoint devices, especially those with shared or multi-user environments, are at heightened risk. The vulnerability could also impact managed print services and environments where print workflows are integral to business operations, potentially disrupting printing services and related workflows.

To mitigate CVE-2025-55690, organizations should implement the following specific measures: 1) Restrict local access to Windows 11 systems, especially limiting access to trusted users and administrators only. 2) Enforce the principle of least privilege by ensuring users operate with minimal necessary rights to reduce the attack surface. 3) Monitor and audit print service-related activities and logs for unusual behavior indicative of exploitation attempts. 4) Disable or restrict the Windows PrintWorkflowUserSvc service on systems where printing workflows are not essential, reducing the attack vector. 5) Employ application control and endpoint detection and response (EDR) solutions to detect anomalous privilege escalation attempts. 6) Prepare for rapid deployment of official patches from Microsoft once available by maintaining an up-to-date asset inventory and patch management process. 7) Educate IT staff about this vulnerability to recognize potential exploitation signs. 8) Consider network segmentation to isolate critical systems and limit lateral movement opportunities post-exploitation.