CVE-2025-26649: 
vulnerability analysis and mitigation

A race condition vulnerability was identified in Windows Secure Channel, tracked as CVE-2025-26649. The vulnerability was disclosed on April 8, 2025, and affects various versions of Microsoft Windows including Windows 11 and Windows Server 2022/2025. This security flaw allows an authorized attacker with local access to elevate their privileges on affected systems (NVD, Rapid7).

The vulnerability is classified as a Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition) issue, identified with CWE-362 and CWE-416 (Use After Free). Microsoft has assigned a CVSS v3.1 base score of 7.0 (HIGH) with the vector string CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating local access requirement, high attack complexity, low privileges required, and potential for high impacts on confidentiality, integrity, and availability (NVD).

The vulnerability can lead to privilege elevation on affected systems when successfully exploited. Given the CVSS scoring, it has the potential to cause high impacts on system confidentiality, integrity, and availability (NVD).

Microsoft has released security updates to address this vulnerability through various KB patches including KB5055523, KB5055526, KB5055527, and KB5055528 for affected versions of Windows 11 and Windows Server 2022/2025 (Rapid7).