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VERIFIEDConfidence: HIGH
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Fact-check summary

Microsoft's CVE-2026-118147 Visual Studio spoofing fix (CWE-295, CVSS 7.4) is corroborated by the company's release notes and Windows Forum coverage listing the same affected versions and fixed builds.

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Home/Tech/Microsoft fixes high-severity spoofing flaw in four Visual Studio versions
VERIFIEDBy Xavier Rivera·Saturday, October 31, 2026 at 3:30 PM AST·1 min read

Microsoft fixes high-severity spoofing flaw in four Visual Studio versions

Microsoft has announced CVE-2026-118147, a high-severity spoofing vulnerability caused by improper certificate validation in Visual Studio. The flaw affects four product lines and requires immediate updates to the listed fixed builds.

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Microsoft fixes high-severity spoofing flaw in four Visual Studio versions
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TL;DRAI · 60 sec read

Microsoft fixed a high-severity spoofing flaw in four Visual Studio versions. The bug stems from improper certificate validation and affects releases from 2017, 2019, 2022, and 2026. CVE-2026-118147 scores 7.4 on CVSS 3.1, with high impacts on confidentiality and integrity. Updated builds are now available.

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Microsoft has announced a high-severity vulnerability that affects four major versions of Visual Studio.

The flaw stems from improper certificate validation. CVE-2026-118147 allows an unauthorized attacker to perform spoofing over a network. The issue carries a CVSS score of 7.4 rated HIGH by Microsoft as the CNA using version 3.1.
The flaw stems from improper certificate validation.

The vector string is CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N. Confidentiality and integrity impacts are rated HIGH while availability impact is NONE.

Four product lines require updates. Affected releases include Visual Studio 2017 Version 15.9 before 15.9.84, Visual Studio 2019 Version 16.11 before 16.11.62, Visual Studio 2022 Version 17.14 before 17.14.44, and Visual Studio 2026 Version 18.11 before 18.11.3.
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Microsoft lists the weakness under CWE-295. The company states that customer action is required to install the fixes.

Fixed builds are now available. The updated versions are 15.9.84, 16.11.62, 17.14.44, and 18.11.3. Microsoft directs users to its Security Update Guide for the corresponding KB articles and release notes.
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The bulletin covers this single CVE. No other vulnerabilities appear in the announcement.
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