CVE-2026-70183: ASP.NET Core Elevation of Privilege Vulnerability

Overview

Severity

High (CVSS 7.5)

CVSS Vector

CVSS:3.1/AV:N/AC:H/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-Oct

Released

2026-10-13

Description

Concurrent execution using shared resource with improper synchronization ('race condition') 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 ELEVATED privileges, which may allow them to perform actions beyond their original permissions. According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires an attacker to win a race condition.

Affected Products (6)

Developer Tools

• Microsoft Visual Studio 2022 version 17.14
• ASP.NET Core 10.0
• ASP.NET Core 8.0
• ASP.NET Core 9.0
• Microsoft Visual Studio 2026 version 18.10
• ASP.NET Core 11.0

Security Updates (4)

• 5130036
• 5130034
• 5130035
• Release Notes

Acknowledgments

<a href="https://www.linkedin.com/in/jiheun-kim/">l8BL</a> with <a href="https://enki.co.kr/">ENKI WhiteHat</a>

Revision History

• 2026-10-13: Information published.