CVE-2026-50343

Microsoft Install Service Elevation of Privilege Vulnerability

Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.

Affected

Microsoft · Windows 10 Version 1809 · Windows 10 Version 21H2 · Windows 10 Version 22H2 · Windows 11 Version 24H2 · Windows 11 Version 25H2 · Windows 11 version 26H1

CVSS v3.1 MICROSOFT

7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.30% chance of exploitation in the next 30 days, 21st percentile

Published

2026-07-14

Updated

2026-10-08

Proof-of-concept exploits (1)

• Rat5ak/CVE-2026-50343-InstallService-EoP48★ · 2026-07-16

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50343

References

• CVE Record
• NVD entry

Related

• CVE-2025-55182
• CVE-2025-59382
• CVE-2026-31413
• CVE-2026-31431
• CVE-2026-3805
• CVE-2026-40791