CVE-2026-69736 in Windows
Summary
by MITRE • 10/14/2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Credential Manager allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified within the Microsoft Windows Credential Manager represents a critical flaw rooted in concurrent execution logic, specifically manifesting as a race condition due to improper synchronization of shared resources. This architectural weakness exists within the subsystem responsible for storing and retrieving user credentials, such as usernames and passwords, which are essential for seamless authentication across various applications and services on the operating system. The core technical issue arises when multiple processes or threads attempt to access or modify these credential stores simultaneously without adequate locking mechanisms or atomic operations. In a properly secured environment, concurrent accesses should be serialized to ensure data integrity and consistency; however, in this instance, the lack of rigorous synchronization allows for a window of opportunity where an attacker can exploit timing discrepancies between checking a condition and acting upon it, commonly known as a Time-of-Check to Time-of-Use (TOCTOU) race condition.
From a technical perspective, the flaw enables an authorized local attacker to manipulate the state of the credential manager during these unsynchronized operations. By carefully crafting requests that trigger specific timing windows, the attacker can cause the system to process data in an unintended order or overwrite critical security parameters with malicious values. This manipulation effectively bypasses standard access controls and authentication checks, allowing the attacker to inject privileged credentials or alter existing ones. The exploitation of this race condition does not require external network access or remote code execution capabilities; rather, it relies solely on local presence and basic user-level permissions, which significantly lowers the barrier for entry compared to many other privilege escalation vectors.
The operational impact of this vulnerability is severe, primarily due to its ability to facilitate Local Privilege Escalation (LPE). Once an attacker successfully exploits the race condition, they can elevate their current low-privileged user account to that of a highly privileged system administrator or even SYSTEM level access. This elevation grants unrestricted control over the affected Windows host, enabling the attacker to install malware, create new administrative accounts, exfiltrate sensitive data from other users on the same machine, and pivot further into connected network segments. The compromise undermines the fundamental trust model of the operating system, as credentials stored in the Credential Manager are often used for automated services and applications that run with elevated privileges, thereby amplifying the blast radius of a single compromised user account.
In terms of industry standard classifications, this vulnerability aligns closely with CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). The specific exploitation technique falls under MITRE ATT&CK framework techniques related to Privilege Escalation via Local Exploitation, particularly those involving manipulation of system processes or services. Understanding these mappings is crucial for security teams as it allows for more precise threat hunting and the application of established mitigation strategies associated with race conditions in operating system components.
Mitigation efforts must focus on both immediate remediation and long-term architectural improvements. The primary defense against this specific vulnerability is the deployment of vendor-provided patches that address the synchronization logic within the Windows Credential Manager subsystem. Organizations should prioritize applying these security updates to all affected systems, ensuring that the latest cumulative updates for their respective Windows versions are installed. Beyond patching, defensive measures include enforcing strict least-privilege principles to limit the potential impact if a user account is compromised. Additionally, implementing application control policies and monitoring for unusual process creation or credential access patterns can help detect exploitation attempts in real-time. Regular security audits focusing on concurrent resource handling in critical system components are also recommended to identify similar synchronization flaws before they can be exploited by adversaries.