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CVE-2023-36558: ASP.NET Core Security Feature Bypass Vulnerability

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-11-14 · updated 2026-06-17

Description

ASP.NET Core Security Feature Bypass Vulnerability

Affected products

• Microsoft .NET: from 6.0.0 before 6.0.25; from 7.0.0 before 7.0.14; 8.0.0-rc1, 8.0.0-rc2 — fixed in 6.0.25, 7.0.14
• Microsoft .NET Core: from 6.0.0 before 6.0.25; from 7.0.0 before 7.0.14; 8.0.0 — fixed in 6.0.25, 7.0.14
• Microsoft Visual Studio 2022 version 17.14: from 17.2 before 17.2.22; from 17.4 before 17.4.14; from 17.6 before 17.6.10; from 17.7 before 17.7.7 — fixed in 17.2.22, 17.4.14, 17.6.10, 17.7.7
• Microsoft .NET 6.0: from 6.0.0 before 6.0.25 — fixed in 6.0.25
• Microsoft .NET 7.0: from 7.0.0 before 7.0.14 — fixed in 7.0.14
• Microsoft .NET 8.0: from 8.0 before 8.0.0 — fixed in 8.0.0
• Microsoft ASP.NET Core 6.0: from 6.0 before 6.0.25 — fixed in 6.0.25
• Microsoft ASP.NET Core 7.0: from 7.0.0 before 7.0.14 — fixed in 7.0.14
• Microsoft ASP.NET Core 8.0: from 8.0 before 8.0.0 — fixed in 8.0.0
• Microsoft Visual Studio 2022 version 17.2: from 17.2.0 before 17.2.22 — fixed in 17.2.22
• Microsoft Visual Studio 2022 version 17.4: from 17.4.0 before 17.4.14 — fixed in 17.4.14
• Microsoft Visual Studio 2022 version 17.6: from 17.6.0 before 17.6.10 — fixed in 17.6.10
• Microsoft Visual Studio 2022 version 17.14: from 17.7.0 before 17.7.7 — fixed in 17.7.7

How to fix

Upgrade to a fixed version: Microsoft .NET 6.0.25, 7.0.14; Microsoft .NET Core 6.0.25, 7.0.14; Microsoft Visual Studio 2022 version 17.14 17.2.22, 17.4.14, 17.6.10, 17.7.7; Microsoft .NET 6.0 6.0.25; Microsoft .NET 7.0 7.0.14; Microsoft .NET 8.0 8.0.0; Microsoft ASP.NET Core 6.0 6.0.25; Microsoft ASP.NET Core 7.0 7.0.14; Microsoft ASP.NET Core 8.0 8.0.0; Microsoft Visual Studio 2022 version 17.2 17.2.22; Microsoft Visual Studio 2022 version 17.4 17.4.14; Microsoft Visual Studio 2022 version 17.6 17.6.10. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36558
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36558

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