Summary
Impact: Information Disclosure. Microsoft rating: Important. Not known to be exploited — Exploitation Unlikely. Customer action: Required.
Details
What type of information could be disclosed by this vulnerability?
This vulnerability could allow a local, non‑administrator attacker to read any files that are accessible to the UPnP Device Host Service, which runs under the LOCAL SERVICE account. This may include restricted system files or configuration data that the attacker would not normally be able to access. The specific information exposed depends on the files that the service is permitted to read.
Security updates
10.0.17763.9020 — https://support.microsoft.com/help/5099538
10.0.20348.5386 — https://support.microsoft.com/help/5099540
10.0.19044.7548 — https://support.microsoft.com/help/5099539
10.0.26100.33158 — https://support.microsoft.com/help/5099536
10.0.26200.8875 — https://support.microsoft.com/help/5101650
10.0.28000.2525 — https://support.microsoft.com/help/5101649
10.0.14393.9339 — https://support.microsoft.com/help/5099535
6.2.9200.26226 — https://support.microsoft.com/help/5099445
6.3.9600.23291 — https://support.microsoft.com/help/5099444
Vulnerabilities 1
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Medium 5.5
Universal Plug and Play (upnp.dll) Information Disclosure Vulnerability
Use of uninitialized resource in Universal Plug and Play (upnp.dll) allows an authorized attacker to disclose information locally.
Revision history
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#1
Information published.
References
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CVE-2026-50455 Universal Plug and Play (upnp.dll) Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50455
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss