CVE-2025-55676 is a vulnerability identified in the Windows USB Video Driver component of Microsoft Windows 11 Version 25H2 (build 10.0.26200.0). It is classified under CWE-209, which pertains to the generation of error messages containing sensitive information. This vulnerability allows an authorized attacker with local access and low privileges to trigger error conditions in the USB Video Driver that result in error messages leaking sensitive information. The leaked information could include internal system details, driver states, or other confidential data that could assist an attacker in further exploitation or reconnaissance activities. The vulnerability does not require user interaction and does not affect system integrity or availability, limiting its impact to confidentiality breaches. The CVSS v3.1 base score is 5.5 (medium severity), reflecting the local attack vector (AV:L), low attack complexity (AC:L), and the requirement for privileges (PR:L). No known exploits have been reported in the wild, and no official patch has been released as of the publication date (October 14, 2025). The vulnerability's presence in a widely deployed operating system version makes it relevant for organizations relying on Windows 11 25H2, particularly those using USB video devices in sensitive environments.

For European organizations, the primary impact of CVE-2025-55676 is the potential disclosure of sensitive information through error messages generated by the Windows USB Video Driver. This information leakage could facilitate further targeted attacks, such as privilege escalation or lateral movement, by providing attackers with insights into system internals. Organizations handling sensitive data or operating in regulated sectors (e.g., finance, healthcare, government) could face increased risk if attackers leverage this vulnerability as part of a multi-stage attack. Since exploitation requires local access and privileges, the threat is more significant in environments where multiple users share systems or where insider threats exist. The lack of impact on system integrity or availability reduces the risk of direct operational disruption but does not diminish the confidentiality concerns. European entities with extensive use of Windows 11 25H2 and USB video peripherals, such as video conferencing or surveillance systems, may be particularly exposed.

1. Implement strict access controls to limit local user privileges on systems running Windows 11 Version 25H2, minimizing the number of users who can trigger the vulnerability. 2. Monitor and audit local system logs for unusual error message generation related to USB video devices, which may indicate exploitation attempts. 3. Restrict physical and logical access to sensitive systems, especially those with USB video peripherals, to trusted personnel only. 4. Employ endpoint detection and response (EDR) solutions capable of detecting anomalous local activity or error message patterns. 5. Stay informed on Microsoft security advisories and apply patches promptly once available. 6. Consider disabling or restricting USB video device usage in high-security environments until a patch is released. 7. Educate users and administrators about the risks of local privilege misuse and the importance of reporting suspicious system behavior.