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CVE-2026-69805: .NET Elevation of Privilege Vulnerability

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-08 · updated 2026-10-31
• Weakness: CWE-73

Description

External control of file name or path in .NET allows an unauthorized attacker to elevate privileges over a network.

Affected products

• Microsoft.Diagnostics.Runtime: before 4.1.740301 — fixed in 4.1.740301
• Microsoft Visual Studio 2022 version 17.14: from 17.14.0 before 17.14.40 — fixed in 17.14.40
• Microsoft Visual Studio 2026 version 18.9: from 18.9.0 before 18.9.3 — fixed in 18.9.3
• Microsoft.Diagnostics.Runtime: from 4.1.740301 before 4.1.740301 — fixed in 4.1.740301
• Microsoft Visual Studio 2022 version 17.14: from 17.14.0 before 17.14.40 — fixed in 17.14.40
• Microsoft Visual Studio 2026 version 18.9: from 18.9.0 before 18.9.3 — fixed in 18.9.3

How to fix

Upgrade to a fixed version: Microsoft.Diagnostics.Runtime 4.1.740301; Microsoft Visual Studio 2022 version 17.14 17.14.40; Microsoft Visual Studio 2026 version 18.9 18.9.3; Microsoft.Diagnostics.Runtime 4.1.740301; Microsoft Visual Studio 2022 version 17.14 17.14.40; Microsoft Visual Studio 2026 version 18.9 18.9.3. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69805

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