CVE-2026-40400
Windows PowerShell Remote Code Execution Vulnerability
HIGH
8
CVSS Score
Published: July 14, 2026 at 05:05 PM UTC
Updated: October 8, 2026 at 06:13 PM UTC
13 products affected across 1 vendorWindows Server 2016Windows Server 2019Windows Server 2012
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Severity
HIGH8
Exploit prediction
EPSS 0.9%
SSVC
No known exploit
Description
Relative path traversal in Windows PowerShell allows an authorized attacker to execute code over a network.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Affected range stops below 7.5.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.6.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.14393.9339, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.17763.9020, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.19044.7548, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.19045.7548, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.26100.8875, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.26200.8875, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.28000.2269, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.28000.2525, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.2.9200.26226, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.3.9600.23291, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.14393.9339, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40400SSVC — Action Prioritization
SSVCNo known exploitNot automatableTotal impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
8HIGHmicrosoft
Vector?
Quick Info
StatusANALYZED
CWE
CWE-23
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