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CVE-2026-118147: Visual Studio Spoofing Vulnerability

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• Public exploit or detection template: none known
• Published: 2026-10-31 · updated 2026-10-31
• Weakness: CWE-295

Description

Improper certificate validation in Visual Studio allows an unauthorized attacker to perform spoofing over a network.

Affected products

• Microsoft Visual Studio 2017 version 15.9: from 15.9.0 before 15.9.84 — fixed in 15.9.84
• Microsoft Visual Studio 2019 version 16.11: from 16.11.0 before 16.11.62 — fixed in 16.11.62
• Microsoft Visual Studio 2026 version 18.11: from 18.11.0 before 18.11.3 — fixed in 18.11.3
• Microsoft Visual Studio 2022 version 17.14: from 17.14.0 before 17.14.44 — fixed in 17.14.44

How to fix

Upgrade to a fixed version: Microsoft Visual Studio 2017 version 15.9 15.9.84; Microsoft Visual Studio 2019 version 16.11 16.11.62; Microsoft Visual Studio 2026 version 18.11 18.11.3; Microsoft Visual Studio 2022 version 17.14 17.14.44. Check the vendor advisory for mitigations.

In the news

• CVE-2026-118147 Visual Studio Spoofing Vulnerability

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118147

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