CVE-2026-26143: CWE-20: Improper Input Validation in Microsoft PowerShell 7.4
CVE-2026-26143 is a high-severity vulnerability in Microsoft PowerShell 7. 4. 0 caused by improper input validation. This flaw allows an unauthorized local attacker to bypass a security feature, potentially leading to full compromise of confidentiality, integrity, and availability. An official fix has been released by Microsoft to address this issue.
AI Analysis
Technical Summary
This vulnerability in Microsoft PowerShell 7.4.0 involves improper input validation (CWE-20) that enables an unauthorized local attacker to bypass a security feature. The CVSS 3.1 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability. The attack vector requires local access with low complexity and no privileges, but user interaction is required. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation allows an unauthorized local attacker to bypass security controls, resulting in complete compromise of confidentiality, integrity, and availability of the affected system. This could lead to unauthorized actions or data exposure within the PowerShell environment.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the patch provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26143 to remediate this vulnerability.
CVE-2026-26143: CWE-20: Improper Input Validation in Microsoft PowerShell 7.4
Description
CVE-2026-26143 is a high-severity vulnerability in Microsoft PowerShell 7. 4. 0 caused by improper input validation. This flaw allows an unauthorized local attacker to bypass a security feature, potentially leading to full compromise of confidentiality, integrity, and availability. An official fix has been released by Microsoft to address this issue.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Microsoft PowerShell 7.4.0 involves improper input validation (CWE-20) that enables an unauthorized local attacker to bypass a security feature. The CVSS 3.1 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability. The attack vector requires local access with low complexity and no privileges, but user interaction is required. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation allows an unauthorized local attacker to bypass security controls, resulting in complete compromise of confidentiality, integrity, and availability of the affected system. This could lead to unauthorized actions or data exposure within the PowerShell environment.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the patch provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26143 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-02-11T16:24:51.134Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26143","vendor":"Microsoft"}]
Threat ID: 69de7a1682d89c981fd6a624
Added to database: 4/14/2026, 5:32:06 PM
Last enriched: 4/14/2026, 7:18:30 PM
Last updated: 4/15/2026, 6:07:40 AM
Views: 4
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