CVE-2026-69294 in Windows
Summary
by MITRE • 09/08/2026
Generation of error message containing sensitive information in Microsoft COM for Windows allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability described involves the improper generation of error messages within the Component Object Model (COM) infrastructure on Microsoft Windows operating systems, leading to a local information disclosure flaw. This issue stems from how certain COM objects handle exceptions and errors during runtime execution. When an operation fails or encounters an unexpected state, the system generates diagnostic output intended for developers or administrators. However, in this specific instance, these error messages are constructed without sufficient sanitization of sensitive internal data. Consequently, when a user with valid authentication credentials triggers the faulty code path, the resulting error message may inadvertently expose details such as memory addresses, file paths, registry keys, or other system-specific identifiers that were not intended for public consumption.
From a technical perspective, this flaw represents a classic case of improper output handling where sensitive context is leaked through standard diagnostic channels rather than being masked by generic placeholders. The vulnerability resides in the COM subsystem, which serves as a foundational framework for software component interoperability on Windows platforms. Because COM objects are frequently invoked by various applications and system services, an attacker who has already gained local access to the machine can exploit this behavior to gather reconnaissance data about the underlying operating system configuration. This aligns with CWE-209, which classifies vulnerabilities where a software product generates an error message that reveals sensitive information. The exposure of such details facilitates further exploitation by providing attackers with precise knowledge of the target environment's architecture and installed components.
The operational impact of this vulnerability is primarily limited to local privilege escalation scenarios or enhanced reconnaissance efforts rather than remote code execution or direct system compromise. Since the requirement for an authorized attacker implies that initial access must already be established, the severity is often rated as medium in terms of overall risk profile. However, the information gained can significantly lower the barrier for subsequent attacks. For instance, knowledge of specific memory layouts or internal object structures can aid in crafting more reliable exploits for other vulnerabilities present on the same system. This behavior also correlates with ATT&CK technique T1082, System Information Discovery, where adversaries collect detailed information about the host to plan further intrusions. The leakage occurs locally and does not typically affect networked systems unless local services are exposed through remote interfaces that allow unauthenticated or weakly authenticated access, which is less common for core COM error handling mechanisms.
Mitigation strategies for this vulnerability focus on both immediate patching and long-term defensive coding practices. Microsoft has addressed similar issues in past security updates by modifying the COM subsystem to ensure that diagnostic messages are stripped of sensitive context before being returned to the caller or logged. Administrators should prioritize installing the latest cumulative security updates provided by Microsoft, as these patches typically include fixes for such information disclosure flaws in core system libraries. For developers and organizations implementing custom COM objects, it is critical to implement strict error handling protocols that sanitize all output streams. This includes ensuring that exception handlers do not serialize internal state variables into log files or user-facing messages without proper filtering. Additionally, enabling detailed auditing on the affected systems can help detect attempts to probe these error conditions, providing visibility into potential reconnaissance activities by malicious actors who have already gained local access.