CVE-2026-47300: ASP.NET Core Elevation of Privilege Vulnerability

Overview

Severity

High (CVSS 8.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Elevation of Privilege

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Jul

Released

2026-07-14

Description

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

FAQ

What privileges could be gained by an attacker who successfully exploited the vulnerability? An attacker who successfully exploited this vulnerability could gain administrator privileges. What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Affected Products (11)

Developer Tools

• .NET 10.0 installed on Linux
• .NET 10.0 installed on Mac OS
• .NET 8.0 installed on Windows
• .NET 8.0 installed on Mac OS
• .NET 8.0 installed on Linux
• .NET 9.0 installed on Linux
• .NET 9.0 installed on Mac OS
• .NET 9.0 installed on Windows
• Microsoft Visual Studio 2022 version 17.12
• Microsoft Visual Studio 2022 version 17.14
• Microsoft Visual Studio 2026 version 18.7

Security Updates (6)

• 5104034
• 5104032
• 5104033
• Release Notes
• Release Notes
• Release Notes

Acknowledgments

Artur Stetsko

Revision History

• 2026-07-14: Information published.