Improper Link Resolution in UPnP Library

Executive Summary

CVE-2026-49180 is a vulnerability in the Universal Plug and Play (upnp.dll) component. It involves improper link resolution before file access, also known as 'link following'. This flaw allows an authorized attacker with local access to exploit the system by following malicious links, leading to unauthorized information disclosure.

The vulnerability is classified as an information disclosure issue, meaning it could enable an attacker to access sensitive data that they should not have permission to view.

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Impact Analysis

If you are using a system with the affected Universal Plug and Play (upnp.dll) component, this vulnerability could impact you in the following ways:

• An authorized attacker with local access to your system could exploit this flaw to disclose sensitive information.
• The disclosed information could be used to further compromise your system or network, depending on the nature of the exposed data.

The CVSS v3.1 score of 5.5 (Medium severity) indicates that while the impact is significant, it requires local access and low privileges to exploit.

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Compliance Impact

This vulnerability could affect compliance with common standards and regulations in the following ways:

• GDPR: If the disclosed information includes personal data of EU citizens, this could constitute a data breach under GDPR. Organizations may be required to report the incident and could face penalties if proper safeguards were not in place.
• HIPAA: If the affected system handles protected health information (PHI), unauthorized disclosure of such data could violate HIPAA's Privacy Rule, leading to potential fines and mandatory corrective actions.

The impact on compliance depends on the nature of the information disclosed and the specific regulatory requirements applicable to your organization. However, any unauthorized information disclosure should be taken seriously to avoid potential compliance violations.

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Detection Guidance

The provided context does not include specific detection methods or commands for identifying this vulnerability on a network or system. Detection would typically involve checking for the presence of the vulnerable component (upnp.dll) and verifying its version or configuration, but no details are available in the given resources.

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Mitigation Strategies

The provided context does not include specific mitigation steps for this vulnerability. However, general best practices for addressing such issues may include:

• Apply the latest security updates or patches provided by Microsoft for the affected Universal Plug and Play component.
• Restrict local access to authorized users only, as the vulnerability requires local access and authorization.
• Monitor Microsoft's official security advisories for updates or guidance related to CVE-2026-49180.

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