CVE-2026-50423: Improper access control in Windows Kernel allows an authorized attacker to elevate privileges locally.

Details

Source

NVD Recent CVEs (US · database · site)

Severity

high — CVSS 7.8

Published

2026-07-14

Last updated

2026-07-21

Exploitation

Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-50423

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.

• Moderate exploitation riskCVE-2026-504232.6% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 84% of all scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• unknownexploitedNCSC-2026-0231 [1.00] [M/H] Vulnerabilities fixed in Microsoft Windowsncsc-nl
• highCVE-2026-50423: Windows Kernel Elevation of Privilege Vulnerabilitymsrc

Recent advisories for Improper access control

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.

• criticalCVE-2026-66803: Improper access control in Azure Cosmos DB allows an unauthorized attacker to execute code ove…nvd · 2026-07-30
• highCVE-2026-12945: IBM Langflow OSS 1.0.0 through 1.10.1 allows authenticated users to access and manipulate othe…nvd · 2026-07-30
• criticalCVE-2026-41920: Improper Access Control vulnerability in Apache Traffic Server. This issue affects Apache Traf…nvd · 2026-07-29
• lowCVE-2026-63236: An improper access control vulnerability in Koollab LMS allowed an unauthenticated attacker to…nvd · 2026-07-29
• lowCVE-2026-63235: An improper access control vulnerability in Koollab LMS allowed an unauthenticated attacker to…nvd · 2026-07-29
• mediumCVE-2026-17570: Improper access control in the PAM password history endpoints in Devolutions Server allows an …nvd · 2026-07-27

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