CVE-2026-47303: 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

Authentication bypass by assumed-immutable data 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 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 Linux
• .NET 9.0 installed on Linux
• .NET 8.0 installed on Mac OS
• .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

Pham Quang Minh

Revision History

• 2026-07-14: Information published.