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PatchSiren cyber security CVE debrief

CVE-2026-118147 Microsoft CVE debrief

CVE-2026-118147 Improper certificate validation in Visual Studio allows an unauthorized attacker to perform spoofing over a network. The CVE record was published on 2026-10-31T19:16:47.213Z and has not been modified since then. This vulnerability affects Visual Studio configurations and requires verification of proper certificate validation to prevent potential spoofing attacks. Defenders responsible for Visual Studio configurations should assess exposure and verify proper certificate validation. The CVE record and NVD entry provide limited information about the vulnerability, and further verification is required to determine the affected versions and potential impact.

Vendor
Microsoft
Product
Microsoft Visual Studio 2017 version 15.9
CVSS
HIGH 7.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-31
Original CVE updated
2026-10-31
Advisory published
2026-10-31
Advisory updated
2026-10-31

Who should care

Defenders responsible for Visual Studio configurations and security should assess exposure and verify proper certificate validation to prevent potential spoofing attacks.

Why it matters

CVE-2026-118147 Improper certificate validation in Visual Studio allows an unauthorized attacker to perform spoofing over a network. Defenders should prioritize verifying Visual Studio configurations and ensuring proper certificate validation to prevent potential spoofing attacks.

  • Verify Visual Studio configurations to ensure proper certificate validation
  • Monitor for potential spoofing attacks
  • Review and update defensive measures to address CVE-2026-118147

Technical summary

Improper certificate validation in Visual Studio allows an unauthorized attacker to perform spoofing over a network. The vulnerability has a CVSS score of 7.4 and is classified as HIGH severity. This vulnerability affects Visual Studio and requires verification of proper certificate validation to prevent potential spoofing attacks. The CVE record and NVD entry provide limited information about the vulnerability, and further verification is required to determine the affected versions and potential impact.

Defensive priority

Defenders should prioritize verifying Visual Studio configurations and ensuring proper certificate validation to prevent potential spoofing attacks.

Recommended defensive actions

  • Verify Visual Studio configurations to ensure proper certificate validation
  • Monitor for potential spoofing attacks
  • Review and update defensive measures to address CVE-2026-118147

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further verification is required to determine the affected versions and potential impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-118147 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-118147

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

  • CVE-2026-118147 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-118147

    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.