CVE-2026-70183

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Race Condition in ASP.NET Core Elevates Privileges

Publication date: 2026-10-13

Last updated on: 2026-10-14

Assigner: Microsoft Corporation

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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-14

Generated

2026-10-19

AI Q&A

2026-10-15

EPSS Evaluated

2026-10-18

NVD

CVE-2026-70183

EUVD

EUVD-2026-99698

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	ASP.NET	Core 10.0 10.0
Microsoft	ASP.NET	Core 11.0 11.0
Microsoft	ASP.NET	Core 8.0 8.0
Microsoft	ASP.NET	Core 9.0 9.0
Microsoft	Microsoft	Visual Studio 2022 version 17.14 17.14.0
Microsoft	Microsoft	Visual Studio 2026 version 18.10 18.10.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-362	The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Attack-Flow Graph

Executive Summary

This is a race condition vulnerability in ASP.NET Core where improper synchronization during concurrent execution allows an authorized attacker to elevate their privileges over a network.

Impact Analysis

An attacker could exploit this to gain higher privileges than intended, potentially accessing sensitive data or performing unauthorized actions in systems using affected ASP.NET Core versions.

Compliance Impact

This vulnerability could lead to unauthorized access or privilege escalation, violating data protection requirements in GDPR and HIPAA, potentially resulting in compliance breaches and legal penalties.

Mitigation Strategies

Apply the latest security updates from Microsoft for ASP.NET Core versions 8.0, 9.0, 10.0, and 11.0 as soon as they become available. Monitor the Microsoft Security Response Center for patches and install them promptly to address the race condition issue.

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