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CVE-2026-62909: .NET Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-11 · updated 2026-10-30
• Weakness: CWE-252

Description

Uncaught exception in .NET allows an authorized attacker to elevate privileges locally.

Affected products

• Microsoft .NET: from 8.0.0 before 8.0.30; from 9.0.0 before 9.0.19; from 10.0.0 before 10.0.11 — fixed in 8.0.30, 9.0.19, 10.0.11
• Microsoft Visual Studio 2022 version 17.14: from 17.14.0 before 17.14.38 — fixed in 17.14.38
• Microsoft Visual Studio 2026 version 18.9: from 18.8.0 before 18.8.3 — fixed in 18.8.3
• Microsoft .NET 10.0 runtime: from 10.0.0 before 10.0.11 — fixed in 10.0.11
• Microsoft .NET 8.0 runtime: from 8.0.0 before 8.0.30 — fixed in 8.0.30
• Microsoft .NET 9.0 runtime: from 9.0.0 before 9.0.19 — fixed in 9.0.19
• Microsoft Visual Studio 2026 version 18.8: from 18.0 before 18.8.3 — fixed in 18.8.3
• Microsoft Visual Studio 2022 version 17.14: from 17.14.0 before 17.14.38 — fixed in 17.14.38

How to fix

Upgrade to a fixed version: Microsoft .NET 8.0.30, 9.0.19, 10.0.11; Microsoft Visual Studio 2022 version 17.14 17.14.38; Microsoft Visual Studio 2026 version 18.9 18.8.3; Microsoft .NET 10.0 runtime 10.0.11; Microsoft .NET 8.0 runtime 8.0.30; Microsoft .NET 9.0 runtime 9.0.19; Microsoft Visual Studio 2026 version 18.8 18.8.3; Microsoft Visual Studio 2022 version 17.14 17.14.38. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62909

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