# CVE-2026-118147: Visual Studio Spoofing Vulnerability

Status: published. Published: 2026-10-31. Updated: 2026-11-07.

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

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: microsoft) — https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118147

## Affected products and versions

- Microsoft / Microsoft Visual Studio 2017 version 15.9: ≥ 15.9.0; < 15.9.84 (affected, custom). Source: CNA: microsoft
- Microsoft / Microsoft Visual Studio 2019 version 16.11: ≥ 16.11.0; < 16.11.62 (affected, custom). Source: CNA: microsoft
- Microsoft / Microsoft Visual Studio 2022 version 17.14: ≥ 17.14.0; < 17.14.44 (affected, custom). Source: CNA: microsoft
- Microsoft / Microsoft Visual Studio 2026 version 18.11: ≥ 18.11.0; < 18.11.3 (affected, custom). Source: CNA: microsoft

## Severity and prioritization

- CVSS 3.1: 7.4 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C; source: CNA: microsoft

- CVSS 3.1: 7.4 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N; source: NVD: secure@microsoft.com

- CISA KEV: No listing in collected sources

- EPSS: 0.61% as of 2026-11-06; percentile 49.50%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-295

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118147 (CNA: microsoft; vendor-advisory, patch)

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118147 (secure@microsoft.com)

## Provenance

- CNA: microsoft: https://www.cve.org/CVERecord?id=CVE-2026-118147; retrieved 2026-11-07; source updated 2026-11-07

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-118147; retrieved 2026-11-07; source updated 2026-11-07

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-118147; retrieved 2026-11-06; source updated Not reported

Revision: ccabc208290dc0609c4813e2b5e52b21efee0721e878e7ae63a9ff6fb6bccf46

Canonical: https://y2.dev/cve/CVE-2026-118147

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- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

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- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

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