CVE-2026-50343: Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.

highpublic exploitCVSS 7.8CVE-2026-50343

Improper privilege management in Microsoft Install Service 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: 2026-07-20
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-50343

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-2026-503433.5% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 88% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-50343	coverage & exploitation status	NVD · CVE.org

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-2026-50343: Microsoft Install Service Elevation of Privilege Vulnerabilitymsrc

Recent advisories for Improper privilege management

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-2026-22622: Improper input validation in one of the session management interface of Eaton's Tripp Lite ser…nvd · 2026-07-30
highCVE-2026-63727: Anchore Enterprise versions from 5.11.0 to 5.27.1 and 6.0.0 contain an improper privilege esca…nvd · 2026-07-28
unknownCVE-2026-12502: Improper Privilege Management (CWE-269) in `/usr/bin/ltsudo` in Loytec LIP-ME201C, L-INX, L-GA…nvd · 2026-07-24
criticalCVE-2026-46738: Dell PowerProtect Data Manager, versions prior to 20.2.0.0, contain(s) an Improper Input Valid…nvd · 2026-07-22
mediumCVE-2026-46737: Dell PowerProtect Data Manager, versions prior to 20.2.0.0, contain(s) an Improper Input Valid…nvd · 2026-07-22
highCVE-2026-40714: Dell PowerProtect Data Manager, versions prior to 20.2.0.0, contain(s) an Improper Input Valid…nvd · 2026-07-22