Microsoft Install Service Elevation of Privilege Vulnerability

HighVendor CVSS 7.0 / 10 1 CVE Published Sep 8, 2026 at 7:00 AM UTC

Summary

Use after free in Microsoft Install Service allows an authorized attacker to elevate privileges locally.

Show 10 more products

Install KB5122882. Install KB5122878. Install KB5122871. Install KB5124008. Install KB5122880. Install KB5124012.

Update history

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

Oct 2, 2026 at 12:40 PM UTC
- The vendor changed the advisory's last-updated date.
Sep 15, 2026 at 3:30 PM UTC
- The vendor changed the advisory's last-updated date.

Sep 8, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Sep 8, 2026 at 7:15 PM UTC
Added to SecurityAlert
We collected the advisory from the official source.
Sep 30, 2026 at 7:00 AM UTC
Updated by Microsoft Security Response Center
The vendor changed the advisory after it was first published.
Oct 28, 2026 at 3:45 AM UTC
Confirmed at the source
Our collector saw this advisory during a later source check.

Details collected from Microsoft Security Response Center.

Official bulletin How SecurityAlert builds this record

Your environment

A vendor advisory can tell you what may be affected. It cannot tell you whether that product and version are installed in your environment.

Watch Windows Server

Keep following

Use the vendor-specific RSS feed or set up alerts for a product your team relies on.

Follow this vendor's RSS feed