CVE-2026-25190 is a vulnerability classified under CWE-426 (Untrusted Search Path) affecting Microsoft Windows 10 Version 1607 (build 10.0.14393.0). The issue resides in the Windows Graphics Device Interface (GDI) component, where the system improperly handles the search path for loading DLLs or executables. This flaw allows an unauthorized local attacker to execute arbitrary code by placing a malicious DLL or executable in a location that is searched before the legitimate system files, leading to code execution with the privileges of the user running the affected process. The vulnerability requires local access and user interaction but does not require elevated privileges, increasing its risk profile on multi-user or shared systems. The CVSS v3.1 score is 7.8 (high), reflecting the ease of exploitation (low attack complexity), no privileges required, and high impact on confidentiality, integrity, and availability. Although no public exploits have been reported yet, the vulnerability's nature makes it a serious threat, especially in environments where legacy Windows 10 systems remain in use. The lack of official patches at the time of publication necessitates immediate attention to alternative mitigations.

If exploited, this vulnerability can lead to arbitrary code execution on affected Windows 10 Version 1607 systems, potentially allowing attackers to gain unauthorized access, escalate privileges, or disrupt system operations. The impact spans confidentiality (unauthorized data access), integrity (modification of system or application files), and availability (system instability or denial of service). Since no privileges are required, any local user or malicious insider could leverage this flaw to compromise the system. This poses a significant risk in enterprise environments, especially those with shared workstations or where legacy systems are still operational. The vulnerability could be used as a foothold for further lateral movement or persistence within a network. The absence of known exploits in the wild currently limits immediate widespread impact, but the potential for future exploitation remains high.

1. Upgrade affected systems to a supported and fully patched version of Windows 10 or later, as Windows 10 Version 1607 is an older release with limited support. 2. Until patches are available, restrict local user permissions to the minimum necessary to reduce the risk of exploitation. 3. Implement application whitelisting and restrict DLL loading paths using Group Policy or AppLocker to prevent loading of untrusted DLLs. 4. Monitor system logs and use endpoint detection and response (EDR) tools to detect anomalous DLL loading or execution behaviors. 5. Educate users to avoid executing untrusted software or opening suspicious files that might trigger the vulnerability. 6. Employ network segmentation to limit the impact of a compromised local account. 7. Regularly audit and remove legacy systems that cannot be updated or patched to reduce attack surface.