CVE-2026-50391: Windows Group Policy Elevation of Privilege Vulnerability

highCVSS 7.8CVE-2026-50391

Improper privilege management in Windows Group Policy allows an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoft product: Windows Group Policy Privilege escalation

What: Improper privilege management allows an authorized attacker to elevate privileges locally.
Who is affected: Users of Windows Group Policy with the affected version.
Urgency: Remediation is urgent due to the high severity and potential for exploitation.
Action: Update to the latest version of Windows Group Policy.

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: high — CVSS 7.8
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50391

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.

Low exploitation riskCVE-2026-503910.28% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-50391	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Windows Group Policy

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.

highCVE-2026-50391: Improper privilege management in Windows Group Policy allows an authorized attacker to elevate…nvd · 2026-07-14
criticalexploitedCVE-2014-1812: Microsoft Windows Group Policy Preferences Password Privilege Escalation Vulnerabilitycisa-kev · 2021-11-03