MSRC_CVE-2026-42896
Vulnerability from csaf_microsoft - Published: 2026-05-12 07:00 - Updated: 2026-05-12 07:00Summary
Windows DWM Core Library Elevation of Privilege Vulnerability
Severity
Important
Notes
Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer: 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.
Customer Action: Required. The vulnerability documented by this CVE requires customer action to resolve.
CWE-190
- Integer Overflow or Wraparound
Affected products
Fixed
8 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.8457
Windows 11 Version 24H2 for ARM64-based Systems
|
10.0.26100.8457 | ||
|
Windows 11 Version 24H2 for x64-based Systems 10.0.26100.8457
Windows 11 Version 24H2 for x64-based Systems
|
10.0.26100.8457 | ||
|
Windows Server 2025 10.0.26100.32860
Windows Server 2025
|
10.0.26100.32860 | ||
|
Windows Server 2025 (Server Core installation) 10.0.26100.32860
Windows Server 2025 (Server Core installation)
|
10.0.26100.32860 | ||
|
Windows 11 Version 25H2 for ARM64-based Systems 10.0.26200.8457
Windows 11 Version 25H2 for ARM64-based Systems
|
10.0.26200.8457 | ||
|
Windows 11 Version 25H2 for x64-based Systems 10.0.26200.8457
Windows 11 Version 25H2 for x64-based Systems
|
10.0.26200.8457 | ||
|
Windows 11 version 26H1 for x64-based Systems 10.0.28000.2113
Windows 11 version 26H1 for x64-based Systems
|
10.0.28000.2113 | ||
|
Windows 11 Version 26H1 for ARM64-based Systems 10.0.28000.2113
Windows 11 Version 26H1 for ARM64-based Systems
|
10.0.28000.2113 |
Known affected
8 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows 11 Version 26H1 for ARM64-based Systems <10.0.28000.2113
Windows 11 Version 26H1 for ARM64-based Systems
|
<10.0.28000.2113 |
Vendor Fix
fix
|
|
|
Windows 11 version 26H1 for x64-based Systems <10.0.28000.2113
Windows 11 version 26H1 for x64-based Systems
|
<10.0.28000.2113 |
Vendor Fix
fix
|
|
|
Windows 11 Version 25H2 for x64-based Systems <10.0.26200.8457
Windows 11 Version 25H2 for x64-based Systems
|
<10.0.26200.8457 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows 11 Version 25H2 for ARM64-based Systems <10.0.26200.8457
Windows 11 Version 25H2 for ARM64-based Systems
|
<10.0.26200.8457 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows Server 2025 (Server Core installation) <10.0.26100.32860
Windows Server 2025 (Server Core installation)
|
<10.0.26100.32860 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows Server 2025 <10.0.26100.32860
Windows Server 2025
|
<10.0.26100.32860 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows 11 Version 24H2 for x64-based Systems <10.0.26100.8457
Windows 11 Version 24H2 for x64-based Systems
|
<10.0.26100.8457 |
Vendor Fix
fix
Vendor Fix
fix
|
|
|
Windows 11 Version 24H2 for ARM64-based Systems <10.0.26100.8457
Windows 11 Version 24H2 for ARM64-based Systems
|
<10.0.26100.8457 |
Vendor Fix
fix
Vendor Fix
fix
|
Threats
Impact
Elevation of Privilege
Exploit Status
Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely
References
7 references
Acknowledgments
namnp with <a href="https://x.com/vcslab">Viettel Cyber Security</a>
{
"document": {
"acknowledgments": [
{
"names": [
"namnp with \u003ca href=\"https://x.com/vcslab\"\u003eViettel Cyber Security\u003c/a\u003e"
]
}
],
"aggregate_severity": {
"namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
"text": "Important"
},
"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
"text": "Public",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "en-US",
"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": {
"category": "vendor",
"contact_details": "secure@microsoft.com",
"name": "Microsoft Security Response Center",
"namespace": "https://msrc.microsoft.com"
},
"references": [
{
"category": "self",
"summary": "CVE-2026-42896 Windows DWM Core Library Elevation of Privilege Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42896"
},
{
"category": "self",
"summary": "CVE-2026-42896 Windows DWM Core Library Elevation of Privilege Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-42896.json"
},
{
"category": "external",
"summary": "Microsoft Exploitability Index",
"url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
},
{
"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": "Windows DWM Core Library Elevation of Privilege Vulnerability",
"tracking": {
"current_release_date": "2026-05-12T07:00:00.000Z",
"generator": {
"date": "2026-05-12T17:08:13.553Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2026-42896",
"initial_release_date": "2026-05-12T07:00:00.000Z",
"revision_history": [
{
"date": "2026-05-12T07:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
}
],
"status": "final",
"version": "1"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.26100.32860",
"product": {
"name": "Windows Server 2025 (Server Core installation) \u003c10.0.26100.32860",
"product_id": "5"
}
},
{
"category": "product_version",
"name": "10.0.26100.32860",
"product": {
"name": "Windows Server 2025 (Server Core installation) 10.0.26100.32860",
"product_id": "12437"
}
}
],
"category": "product_name",
"name": "Windows Server 2025 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.26200.8457",
"product": {
"name": "Windows 11 Version 25H2 for ARM64-based Systems \u003c10.0.26200.8457",
"product_id": "4"
}
},
{
"category": "product_version",
"name": "10.0.26200.8457",
"product": {
"name": "Windows 11 Version 25H2 for ARM64-based Systems 10.0.26200.8457",
"product_id": "20437"
}
}
],
"category": "product_name",
"name": "Windows 11 Version 25H2 for ARM64-based Systems"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.26200.8457",
"product": {
"name": "Windows 11 Version 25H2 for x64-based Systems \u003c10.0.26200.8457",
"product_id": "3"
}
},
{
"category": "product_version",
"name": "10.0.26200.8457",
"product": {
"name": "Windows 11 Version 25H2 for x64-based Systems 10.0.26200.8457",
"product_id": "20438"
}
}
],
"category": "product_name",
"name": "Windows 11 Version 25H2 for x64-based Systems"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.26100.8457",
"product": {
"name": "Windows 11 Version 24H2 for ARM64-based Systems \u003c10.0.26100.8457",
"product_id": "8"
}
},
{
"category": "product_version",
"name": "10.0.26100.8457",
"product": {
"name": "Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.8457",
"product_id": "12389"
}
}
],
"category": "product_name",
"name": "Windows 11 Version 24H2 for ARM64-based Systems"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.26100.8457",
"product": {
"name": "Windows 11 Version 24H2 for x64-based Systems \u003c10.0.26100.8457",
"product_id": "7"
}
},
{
"category": "product_version",
"name": "10.0.26100.8457",
"product": {
"name": "Windows 11 Version 24H2 for x64-based Systems 10.0.26100.8457",
"product_id": "12390"
}
}
],
"category": "product_name",
"name": "Windows 11 Version 24H2 for x64-based Systems"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.26100.32860",
"product": {
"name": "Windows Server 2025 \u003c10.0.26100.32860",
"product_id": "6"
}
},
{
"category": "product_version",
"name": "10.0.26100.32860",
"product": {
"name": "Windows Server 2025 10.0.26100.32860",
"product_id": "12436"
}
}
],
"category": "product_name",
"name": "Windows Server 2025"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.28000.2113",
"product": {
"name": "Windows 11 version 26H1 for x64-based Systems \u003c10.0.28000.2113",
"product_id": "2"
}
},
{
"category": "product_version",
"name": "10.0.28000.2113",
"product": {
"name": "Windows 11 version 26H1 for x64-based Systems 10.0.28000.2113",
"product_id": "20853"
}
}
],
"category": "product_name",
"name": "Windows 11 version 26H1 for x64-based Systems"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.28000.2113",
"product": {
"name": "Windows 11 Version 26H1 for ARM64-based Systems \u003c10.0.28000.2113",
"product_id": "1"
}
},
{
"category": "product_version",
"name": "10.0.28000.2113",
"product": {
"name": "Windows 11 Version 26H1 for ARM64-based Systems 10.0.28000.2113",
"product_id": "20854"
}
}
],
"category": "product_name",
"name": "Windows 11 Version 26H1 for ARM64-based Systems"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-42896",
"cwe": {
"id": "CWE-190",
"name": "Integer Overflow or Wraparound"
},
"notes": [
{
"category": "general",
"text": "Microsoft",
"title": "Assigning CNA"
},
{
"category": "faq",
"text": "An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.",
"title": "What privileges could be gained by an attacker who successfully exploited this vulnerability?"
}
],
"product_status": {
"fixed": [
"12389",
"12390",
"12436",
"12437",
"20437",
"20438",
"20853",
"20854"
],
"known_affected": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2026-42896 Windows DWM Core Library Elevation of Privilege Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42896"
},
{
"category": "self",
"summary": "CVE-2026-42896 Windows DWM Core Library Elevation of Privilege Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-42896.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-12T07:00:00.000Z",
"details": "10.0.26100.32860:Security Update:https://support.microsoft.com/help/5087539",
"product_ids": [
"5",
"6"
],
"url": "https://support.microsoft.com/help/5087539"
},
{
"category": "vendor_fix",
"date": "2026-05-12T07:00:00.000Z",
"details": "10.0.26100.32772:Security Hotpatch Update:https://support.microsoft.com/help/5087423",
"product_ids": [
"5",
"6"
],
"url": "https://support.microsoft.com/help/5087423"
},
{
"category": "vendor_fix",
"date": "2026-05-12T07:00:00.000Z",
"details": "10.0.26200.8457:Security Update:https://support.microsoft.com/help/5089549",
"product_ids": [
"4",
"3"
],
"url": "https://support.microsoft.com/help/5089549"
},
{
"category": "vendor_fix",
"date": "2026-05-12T07:00:00.000Z",
"details": "10.0.26200.8390:Security Hotpatch Update:https://support.microsoft.com/help/5089466",
"product_ids": [
"4",
"3"
],
"url": "https://support.microsoft.com/help/5089466"
},
{
"category": "vendor_fix",
"date": "2026-05-12T07:00:00.000Z",
"details": "10.0.26100.8457:Security Update:https://support.microsoft.com/help/5089549",
"product_ids": [
"8",
"7"
],
"url": "https://support.microsoft.com/help/5089549"
},
{
"category": "vendor_fix",
"date": "2026-05-12T07:00:00.000Z",
"details": "10.0.26100.8390:Security Hotpatch Update:https://support.microsoft.com/help/5089466",
"product_ids": [
"8",
"7"
],
"url": "https://support.microsoft.com/help/5089466"
},
{
"category": "vendor_fix",
"date": "2026-05-12T07:00:00.000Z",
"details": "10.0.28000.2113:Security Update:https://support.microsoft.com/help/5089548",
"product_ids": [
"2",
"1"
],
"url": "https://support.microsoft.com/help/5089548"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"environmentalsScore": 0.0,
"exploitCodeMaturity": "UNPROVEN",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"remediationLevel": "OFFICIAL_FIX",
"reportConfidence": "CONFIRMED",
"scope": "UNCHANGED",
"temporalScore": 6.8,
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
"version": "3.1"
},
"products": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8"
]
}
],
"threats": [
{
"category": "impact",
"details": "Elevation of Privilege"
},
{
"category": "exploit_status",
"details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
}
],
"title": "Windows DWM Core Library Elevation of Privilege Vulnerability"
}
]
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…