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CVE-2026-50526 Microsoft CVE debrief

CVE-2026-50526 is a HIGH severity vulnerability in .NET, with a CVSS score of 7. The vulnerability is related to improper link resolution before file access, also known as 'link following', which allows an authorized attacker to perform tampering locally. This vulnerability affects .NET versions 8.0.0 to 8.0.29, 9.0.0 to 9.0.18, and 10.0.0 to 10.0.6, as well as Visual Studio 2022 versions 17.12.0 to 17.12.22 and 17.14.0 to 17.14.36, and Visual Studio 2026 version 18.7.0 to 18.7.4. Users of these versions should be aware of this vulnerability and take necessary actions to mitigate it. The vulnerability allows an authorized attacker to perform tampering locally by exploiting improper link resolution before file access. It is recommended that users of affected .NET and Visual Studio installations take immediate action to patch their systems.

Vendor
Microsoft
Product
.NET 10.0
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-22
Advisory published
2026-07-14
Advisory updated
2026-07-22

Who should care

Users of .NET, particularly versions 8.0.0 to 8.0.29, 9.0.0 to 9.0.18, and 10.0.0 to 10.0.6, as well as Visual Studio 2022 versions 17.12.0 to 17.12.22 and 17.14.0 to 17.14.36, and Visual Studio 2026 version 18.7.0 to 18.7.4, should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability is caused by improper link resolution before file access in .NET. This allows an authorized attacker to perform tampering locally. The affected products include .NET versions 8.0.0 to 8.0.29, 9.0.0 to 9.0.18, and 10.0.0 to 10.0.6, as well as Visual Studio 2022 versions 17.12.0 to 17.12.22 and 17.14.0 to 17.14.36, and Visual Studio 2026 version 18.7.0 to 18.7.4.

Defensive priority

High priority should be given to patching .NET versions 8.0.0 to 8.0.29, 9.0.0 to 9.0.18, and 10.0.0 to 10.0.6, as well as Visual Studio 2022 versions 17.12.0 to 17.12.22 and 17.14.0 to 17.14.36, and Visual Studio 2026 version 18.7.0 to 18.7.4.

Recommended defensive actions

  • Apply patches for .NET versions 8.0.29, 9.0.18, and 10.0.6
  • Apply patches for Visual Studio 2022 versions 17.12.22 and 17.14.36
  • Apply patches for Visual Studio 2026 version 18.7.4
  • Inventory and update affected .NET and Visual Studio installations
  • Monitor for suspicious activity related to tampering

Evidence notes

The CVE record was published on 2026-07-14T20:17:37.240Z and was last modified on 2026-07-22T21:17:40.993Z. The NVD entry is currently Analyzed. The vulnerability has been identified in .NET versions 8.0.0 to 8.0.29, 9.0.0 to 9.0.18, and 10.0.0 to 10.0.6, as well as Visual Studio 2022 versions 17.12.0 to 17.12.22 and 17.14.0 to 17.14.36, and Visual Studio 2026 version 18.7.0 to 18.7.4. Defenders should verify the affected scope and severity, and review context to ensure proper mitigation.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50526 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50526

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-50526 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50526

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.