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CVE-2026-49801: Windows SMB Information Disclosure Vulnerability

mediumCVSS 5.5CVE-2026-49801
Use of uninitialized resource in Windows SMB allows an authorized attacker to disclose information locally.

CSIRTS triage

vendor: Microsoftproduct: Windows SMBInformation disclosure
What
Use of uninitialized resource in Windows SMB allows an authorized attacker to disclose information locally.
Who is affected
Authorized users of Windows SMB.
Urgency
Remediation is medium due to the medium severity and potential for information disclosure.
Action
Apply the latest security patch for Windows SMB.

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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-2026-49801

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-2026-49801coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Windows SMB Information

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