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CVE-2026-50455: Universal Plug and Play (upnp.dll) Information Disclosure Vulnerability

mediumCVSS 5.5CVE-2026-50455
Use of uninitialized resource in Universal Plug and Play (upnp.dll) allows an authorized attacker to disclose information locally.

CSIRTS triage

vendor: Microsoftproduct: Universal Plug and PlayInformation disclosure
What
Use of uninitialized resource in Universal Plug and Play (upnp.dll) allows an authorized attacker to disclose information locally.
Who is affected
Authorized users of systems using Universal Plug and Play.
Urgency
Remediation is medium urgency as it can lead to information disclosure.
Action
Apply the latest security patch for Universal Plug and Play.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50455

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-50455coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Universal Plug and

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center