Security October 2026 CVE-2026-118147
AssessmentImproper certificate validation in Visual Studio allows an unauthorized attacker to perform spoofing over a network.
Severity Important
CVSS base score 7.4
Impact Spoofing
Exploitation detected No known exploitation (MSRC assessment)
Exploitability Exploitation Less Likely
Publicly disclosed No (MSRC assessment)
EPSS · 30-day forecast 0.6% FIRST forecast dated 10 Nov 2026, for the following 30 days · FIRST percentile 49.6% · about EPSS
Customer action Required: follow the MSRC remediation guidance
More details
CVSS vector 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
Public detection template No Nuclei template is listed in the current collected catalog
Component Visual Studio
Weakness CWE-295: Improper Certificate Validation
Issued by Microsoft
Last revised 30 Oct 2026 CVSS 3.1 base metrics Red raises the risk · green lowers it
Attack vector NetworkAV:N
Attack complexity HighAC:H
Privileges required NonePR:N
User interaction NoneUI:N
Scope UnchangedS:U
Confidentiality HighC:H
Integrity HighI:H
Availability NoneA:N
Updates that fix it0 KBs No KB listed No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.
Affected productsDeveloper Tools
4 affected products
Microsoft Visual Studio 2017 version 15.9 Microsoft Visual Studio 2019 version 16.11 Microsoft Visual Studio 2022 version 17.14 Microsoft Visual Studio 2026 version 18.11
Source. This summary comes from MSRC's public CVRF document for October 2026. If the MSRC page is blocked in your browser, the NVD and CVE.org records carry the same identifier. None of this says whether your devices are affected.
What changed
Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
6 Nov 2026 · 17:32:22 UTC Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
6 Nov 2026 · 16:31:02 UTC Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
2 Nov 2026 · 17:30:39 UTC Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
2 Nov 2026 · 16:27:39 UTC Page history
Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.
Cite this version Field-level log (27)
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10 Nov 2026 · 18:32:11 UTC
EPSS 0.6%; scored 9 Nov 2026 → 0.6%; scored 10 Nov 2026 9 Nov 2026 · 22:24:37 UTC
EPSS 0.6%; scored 8 Nov 2026 → 0.6%; scored 9 Nov 2026 8 Nov 2026 · 15:16:05 UTC
EPSS 0.6%; scored 7 Nov 2026 → 0.6%; scored 8 Nov 2026 7 Nov 2026 · 16:12:44 UTC
EPSS 0.6%; scored 6 Nov 2026 → 0.6%; scored 7 Nov 2026 6 Nov 2026 · 19:15:37 UTC
EPSS 0.6%; scored 5 Nov 2026 → 0.6%; scored 6 Nov 2026 6 Nov 2026 · 17:32:22 UTC
Public detection template Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed 6 Nov 2026 · 17:32:22 UTC
Source coverage: public-exploit-code Incomplete → Current 6 Nov 2026 · 17:32:22 UTC
Source coverage: first-epss Incomplete → Current 6 Nov 2026 · 17:32:22 UTC
Source coverage: msrc-cvrf Incomplete → Current 6 Nov 2026 · 16:31:02 UTC
Public detection template No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained 6 Nov 2026 · 16:31:02 UTC
Source coverage: public-exploit-code Current → Incomplete 6 Nov 2026 · 16:31:02 UTC
Source coverage: first-epss Current → Incomplete 6 Nov 2026 · 16:31:02 UTC
Source coverage: msrc-cvrf Current → Incomplete 5 Nov 2026 · 23:42:03 UTC
EPSS 0.6%; scored 4 Nov 2026 → 0.6%; scored 5 Nov 2026 5 Nov 2026 · 02:36:20 UTC
EPSS 0.6%; scored 3 Nov 2026 → 0.6%; scored 4 Nov 2026 4 Nov 2026 · 03:04:37 UTC
EPSS 0.6%; scored 2 Nov 2026 → 0.6%; scored 3 Nov 2026 3 Nov 2026 · 01:53:36 UTC
EPSS 0.6%; scored 1 Nov 2026 → 0.6%; scored 2 Nov 2026 2 Nov 2026 · 17:30:39 UTC
Public detection template Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed 2 Nov 2026 · 17:30:39 UTC
Source coverage: public-exploit-code Incomplete → Current 2 Nov 2026 · 17:30:39 UTC
Source coverage: first-epss Incomplete → Current 2 Nov 2026 · 17:30:39 UTC
Source coverage: msrc-cvrf Incomplete → Current 2 Nov 2026 · 16:27:39 UTC
Public detection template No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained 2 Nov 2026 · 16:27:39 UTC
Source coverage: public-exploit-code Current → Incomplete 2 Nov 2026 · 16:27:39 UTC
Source coverage: first-epss Current → Incomplete 2 Nov 2026 · 16:27:39 UTC
Source coverage: msrc-cvrf Current → Incomplete 2 Nov 2026 · 00:36:51 UTC
EPSS No EPSS score collected → 0.6%; scored 1 Nov 2026 31 Oct 2026 · 18:22:15 UTC
Issued by Not stated → Microsoft Explore global source statements, affected packages and advisory history for CVE-2026-118147 . The catalog has a separate collection scope from Microsoft release records.
Overview Affected History ConnectionsCISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.
No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.
cve-program · CVE-2026-118147 Published Visual Studio Spoofing Vulnerability Improper certificate validation in Visual Studio allows an unauthorized attacker to perform spoofing over a network.
Source published 31 Oct 2026 18:13:37 UTC
Source modified 10 Nov 2026 20:47:23 UTC
Observed here 10 Nov 2026 22:21:22 UTC
Source terms CVE Program Terms of Use Original source record · Cite this exact observation · Complete original publisher JSON
This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use . Source text is retained; field grouping and change labels are provided by ChangeIntel.
CVSS 3.1 · 7.4 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