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HIGH severity

CVE-2026-118147 — Microsoft

HIGH

CVE-2026-118147 is a high-severity (CVSS 7.4) CWE-295 vulnerability. No vendor fix is recorded yet; mitigation options are listed below.

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

Published
Updated
Affected
—
Patched
—
Exploits
None indexed
Exploitation data as of Oct 31, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Description

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

Detection & mitigation playbook

Vulnerability

  1. Detect

    Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

  2. Remediation status

    No fixed release is recorded for CVE-2026-118147 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

  3. Mitigate without a patch

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Improper certificate validation in Visual Studio allows an unauthorized attacker to perform spoofing over a network.
O3 Security · Impact-Aware SCA

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CVE-2026-118147: Microsoft (High 7.4)