Home/CVE/Improper input validation in Microsoft PowerShell allows an unauthorized attacker to bypass a security feature locally.
CVE

CVE-2026-26143

Improper input validation in Microsoft PowerShell allows an unauthorized attacker to bypass a security feature locally.

Improper input validation in Microsoft PowerShell allows an unauthorized attacker to bypass a security feature locally.

HIGH · CVSS 7.8 EPSS 0.0006
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules8 YARA rules0
⬡

Weakness Classification

CWE-20Improper Input Validation
▤

Affected Products & Versions

2
microsoft powershell>= 7.4 and < 7.4.14
microsoft powershell>= 7.5 and < 7.5.5
◈

Sigma Hunt Rules

8
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productcriticalBad Opsec Powershell Code Artifacts
productcriticalSuspicious PowerShell Mailbox Export to Share - PS
productcriticalSuspicious PowerShell Mailbox Export to Share
productcriticalHackTool - Empire PowerShell UAC Bypass
productcriticalHackTool - DInjector PowerShell Cradle Execution
producthighDelete Volume Shadow Copies Via WMI With PowerShell
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Scoring & Timeline

7.8
HIGH · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD14 Apr 2026 · 06:16 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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Vendor Advisories

1
msrcCVE-2026-26143Security Feature Bypass
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