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HighVulnerabilityCVE-2026-118147updated 31 Oct 2026, 23:20 UTC

Visual Studio may accept fake server identities on the network

Visual Studio does not properly check whether a server's security certificate is genuine. An attacker on the same network could pretend to be a trusted server.

Official, 3 sources
SeverityHighCVSS 7.4 of 10
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official, 3 sourcesBacked by an official source

What happened

Improper certificate validation in Visual Studio allows an unauthorized attacker to perform network-based spoofing. The advisory rates it high (CVSS 7.4).

Why it is dangerous: An attacker who can reach you over the network may impersonate a trusted service, which could mislead Visual Studio into trusting or sending data to the wrong server. The provided material does not say which features or data are exposed.

Are you affected?

You are affected if you use a Visual Studio version covered by Microsoft's advisory for CVE-2026-118147, especially on networks where an attacker could intercept traffic.

Visual Studio (specific versions not stated in the provided material)

What to do

  1. Check Microsoft's advisory for CVE-2026-118147 to confirm which Visual Studio versions are affected and which version fixes the flaw.
  2. Install the fixed Visual Studio update, then restart Visual Studio.
  3. Until updated, avoid using Visual Studio on untrusted or public networks.

Timeline

  1. 30 Oct 2026, 14:00 UTC
    Publicly disclosed
  2. 30 Oct 2026, 14:00 UTC
    Reported by Microsoft MSRC · Microsoft MSRC
  3. 30 Oct 2026, 19:04 UTC
    Picked up by Zero Radar
  4. 31 Oct 2026, 19:18 UTC
    NVD reported on it · NVD
  5. 31 Oct 2026, 23:20 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 3 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-118147 · GHSA-hqh8-88g9-j6xw
CVSS
7.4 / 10
Disclosed
30 Oct 2026, 14:00 UTC
On Zero Radar
30 Oct 2026, 19:04 UTC (5 h after disclosure)
Last change
31 Oct 2026, 23:20 UTC

The plain-language parts and the attack diagram were written by an AI model (claude-haiku-5-5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Visual Studio may accept fake server identities on the network · Zero Radar