Summary
Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
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 have a deep understanding of the system and the ability to manipulate its components to trigger a specific condition. Successful exploitation is not guaranteed and depends on a combination of factors that may include the environment, system configuration, and the presence of additional security measures.
Security updates
18.10.4 — https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes
17.14.42 — https://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes
10.0.13 — https://github.com/dotnet/announcements/issues/458
Vulnerabilities 1
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High 7.5
ASP.NET Core Elevation of Privilege Vulnerability
Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
Revision history
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#2
Updated the Security Updates table to add download and KB article links for Microsoft Visual Studio. This is an informational change only; the fixed builds are unchanged.
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#1
Information published.
References
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CVE-2026-70179 ASP.NET Core Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70179
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss