{
"document": {
"acknowledgments": [
{
"names": [
"Ayato Shitomi"
]
},
{
"names": [
"Coşkun Bağrıaçık"
]
},
{
"names": [
"陳宥升 (CheN..) https://github.com/samer666569"
]
},
{
"names": [
"MinhNV5 with MBBank"
]
},
{
"names": [
"YMsora"
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}
],
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"text": "Important"
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"distribution": {
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"tlp": {
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"url": "https://www.first.org/tlp/"
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"notes": [
{
"category": "general",
"text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
"title": "Additional Resources"
},
{
"category": "legal_disclaimer",
"text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
"title": "Disclaimer"
},
{
"category": "general",
"text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
"title": "Customer Action"
}
],
"publisher": {
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"contact_details": "secure@microsoft.com",
"name": "Microsoft Security Response Center",
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{
"category": "self",
"summary": "CVE-2026-70338 Microsoft PowerShell Security Feature Bypass Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70338"
},
{
"category": "self",
"summary": "CVE-2026-70338 Microsoft PowerShell Security Feature Bypass Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-70338.json"
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{
"category": "external",
"summary": "Microsoft Exploitability Index",
"url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
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{
"category": "external",
"summary": "Microsoft Support Lifecycle",
"url": "https://support.microsoft.com/lifecycle"
},
{
"category": "external",
"summary": "Common Vulnerability Scoring System",
"url": "https://www.first.org/cvss"
}
],
"title": "Microsoft PowerShell Security Feature Bypass Vulnerability",
"tracking": {
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"generator": {
"date": "2026-08-28T01:58:58.652Z",
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},
"id": "msrc_CVE-2026-70338",
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{
"date": "2026-08-11T07:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
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{
"date": "2026-08-14T07:00:00.000Z",
"legacy_version": "2",
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"summary": "The security updates for Powershell have been updated."
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{
"date": "2026-08-18T07:00:00.000Z",
"legacy_version": "2.1",
"number": "3",
"summary": "Acknowledgement Updated"
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{
"date": "2026-08-19T07:00:00.000Z",
"legacy_version": "2.2",
"number": "4",
"summary": "Acknowledgement Updated"
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"name": "Improper Control of Generation of Code ('Code Injection')"
},
"notes": [
{
"category": "general",
"text": "Microsoft",
"title": "Assigning CNA"
},
{
"category": "faq",
"text": "An attacker who successfully exploited this vulnerability could bypass Windows Defender Application Control and PowerShell Constrained Language Mode restrictions, allowing untrusted code to run with capabilities those protections are designed to block.",
"title": "What kind of security feature could be bypassed by successfully exploiting this vulnerability?"
}
],
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},
{
"category": "self",
"summary": "CVE-2026-70338 Microsoft PowerShell Security Feature Bypass Vulnerability - CSAF",
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{
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"exploitCodeMaturity": "UNPROVEN",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"remediationLevel": "OFFICIAL_FIX",
"reportConfidence": "CONFIRMED",
"scope": "UNCHANGED",
"temporalScore": 6.8,
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
"version": "3.1"
},
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"3"
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}
],
"threats": [
{
"category": "impact",
"details": "Security Feature Bypass"
},
{
"category": "exploit_status",
"details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
}
],
"title": "Microsoft PowerShell Security Feature Bypass Vulnerability"
}
]
}