CVE-2026-50343
Microsoft Install Service Elevation of Privilege Vulnerability
Vexday Risk Score
41Attention
SSVC decision (CISA)
Attend
PoC available → attend closely
Exploit maturity
Proof of concept
Popular PoC on GitHub (18 stars) — exploitation code widely available.
CVSS 7.8EPSS 2.5%KEV nãoPoC públicaNuclei —Metasploit —Patch referenciado
Lifecycle
03 Jun 2026Public PoC
14 Jul 2026Published on NVD
Recommendation: Plan a near-term fix — a public PoC already exists.
Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Affected products
Microsoft · Windows 10 Version 1809Microsoft · Windows 10 Version 21H2Microsoft · Windows 10 Version 22H2Microsoft · Windows 11 Version 24H2Microsoft · Windows 11 Version 25H2Microsoft · Windows 11 version 26H1Microsoft · Windows Server 2019Microsoft · Windows Server 2019 (Server Core installation)Microsoft · Windows Server 2022Microsoft · Windows Server 2025Microsoft · Windows Server 2025 (Server Core installation)public PoCs found — 1
githubgithub.com/Rat5ak/CVE-2026-50343-InstallService-EoP★ 18⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.