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CVE-2026-50646 Microsoft CVE debrief

A protection mechanism failure in .NET Framework has been identified, allowing an unauthorized attacker to execute code locally. This vulnerability has been assigned a CVSS score of 7.8 and is considered HIGH severity. The vulnerability affects .NET Framework and can be exploited by an attacker to execute code locally. System administrators and developers should prioritize patching this vulnerability to prevent local code execution.

Vendor
Microsoft
Product
.NET 8.0
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-21
Advisory published
2026-07-14
Advisory updated
2026-07-21

Who should care

System administrators and developers using .NET Framework should prioritize patching this vulnerability to prevent local code execution. This vulnerability can be exploited by an attacker to execute code locally, which can have a significant impact on the security of affected systems.

Technical summary

The vulnerability, CVE-2026-50646, is caused by a protection mechanism failure in .NET Framework. An unauthorized attacker can exploit this vulnerability to execute code locally. The CVSS vector for this vulnerability is CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The vulnerability affects .NET Framework and can be exploited by an attacker to execute code locally.

Defensive priority

High priority should be given to patching this vulnerability due to its high severity and potential impact.

Recommended defensive actions

  • Apply the official patch from Microsoft as soon as possible.
  • Review and update .NET Framework installations to ensure they are up-to-date.
  • Implement compensating controls, such as monitoring for suspicious activity.
  • Verify the integrity of affected systems and monitor for potential exploitation attempts.
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record was published on 2026-07-14T20:17:37.670Z and was last modified on 2026-07-21T00:17:21.690Z. The NVD entry is currently Awaiting Analysis. The vulnerability has been assigned a CVSS score of 7.8 and is considered HIGH severity. The CVE record and NVD entry provide additional information about the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50646 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50646

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

  • CVE-2026-50646 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50646

    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.