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CVE-2026-34348: Windows Event Logging Service Information Disclosure Vulnerability

mediumCVSS 6.5CVE-2026-34348
Protection mechanism failure in Windows Event Logging Service allows an authorized attacker to disclose information over a network.

CSIRTS triage

vendor: Microsoftproduct: WindowsInformation disclosure
What
Protection mechanism failure in Windows Event Logging Service allows an authorized attacker to disclose information over a network.
Who is affected
Authorized attackers on affected Windows systems with network access.
Urgency
Remediation is important due to medium severity and potential for information disclosure over the network.
Action
Apply the latest security patch for Windows.

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 6.5
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34348

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-2026-34348coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Windows Event Logging

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