CVE-2026-50409 in Windows
Summary
by MITRE • 07/14/2026
Exposure of sensitive information to an unauthorized actor in Windows Overlay Filter allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 07/15/2026
The vulnerability described represents a critical information disclosure flaw within the Windows Overlay Filter component that operates at the kernel level of the operating system. This issue enables an authenticated attacker with local access to potentially extract sensitive data that should remain protected from unauthorized entities. The Windows Overlay Filter serves as a crucial network filtering mechanism that manages traffic flow and security policies, making this exposure particularly concerning for system integrity and data protection.
The technical implementation of this vulnerability stems from inadequate access controls within the overlay filter subsystem where sensitive information structures or metadata are exposed through improper privilege checking mechanisms. This flaw allows an attacker who has already established local authentication to leverage elevated privileges within the kernel context to access information that should be restricted to specific security domains. The vulnerability operates at a low level of the operating system architecture where traditional user-mode protections may not fully apply, creating a direct pathway for information extraction.
From an operational perspective, this vulnerability presents significant risk to enterprise environments where local privilege escalation is already possible through various attack vectors such as phishing, credential theft, or exploitation of other system weaknesses. Once an attacker achieves local access, they can utilize this information disclosure capability to gather sensitive data including but not limited to network configuration details, security policy information, user credentials stored in memory, or system identification parameters that could facilitate further attacks. The impact extends beyond immediate information leakage as the disclosed data can serve as a foundation for more sophisticated exploitation techniques.
The vulnerability aligns with CWE-200, which specifically addresses the exposure of sensitive information to unauthorized actors, and demonstrates characteristics consistent with ATT&CK technique T1082, focusing on system information discovery. Organizations should implement immediate mitigations including applying security patches from Microsoft as soon as available, implementing network segmentation to limit local access privileges, and conducting comprehensive monitoring for suspicious local activity patterns. Additional protective measures include restricting local user accounts through mandatory access controls, enabling kernel-mode protection mechanisms, and establishing robust audit trails that can detect unauthorized information access attempts.
Security hardening practices should emphasize limiting the attack surface by disabling unnecessary overlay filter functionality, implementing strict privilege separation between system components, and deploying endpoint detection and response solutions capable of monitoring kernel-level information access patterns. Regular security assessments should focus on identifying potential privilege escalation paths that could lead to exploitation of similar kernel-level vulnerabilities. Organizations must also consider the broader implications of local information disclosure in their incident response planning, as this type of vulnerability can significantly impact forensic analysis and breach containment efforts due to the sensitive nature of data potentially accessible through such exposures.