Microsoft Security Response CenterCVE-2026-47300

ASP.NET Core Elevation of Privilege Vulnerability

HighVendor CVSS 8.8 / 10 1 CVE Published Jul 14, 2026 at 7:00 AM UTC

Summary

Incorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

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Release Notes Install KB5104034. Install KB5104032. Install KB5104033.

Jul 14, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Sep 2, 2026 at 11:20 PM UTC
Added to SecurityAlert
We collected the advisory from the official source.
Oct 28, 2026 at 9:50 AM UTC
Confirmed at the source
Our collector saw this advisory during a later source check.

Details collected from Microsoft Security Response Center.

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