What is CVE-2026-118147?
Improper certificate validation in Visual Studio allows an unauthorized attacker to perform spoofing over a network.
The record classifies CVE-2026-118147 under weakness class CWE-295. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity. 4 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 7 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 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 - EPSS (FIRST)
- 0.6% probability of exploitation in the next 30 days, higher than 49.3% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 5.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-10-31
Is CVE-2026-118147 being exploited?
It currently carries a trending score of 47 in the Threadlinqs vulnerability feed.
Affected products and versions
- Microsoft: Visual Studio 2017 version 15.9, Visual Studio 2019 version 16.11, Visual Studio 2022 version 17.14, Visual Studio 2026 version 18.11
How to fix CVE-2026-118147
Patch reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118147. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-118147
1 tracked threat in the Threadlinqs corpus references CVE-2026-118147, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, NVD, GitHub Security Advisories, FIRST EPSS. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.