MSRC_CVE-2026-33826
Vulnerability from csaf_microsoft - Published: 2026-04-14 07:00 - Updated: 2026-04-14 07:00Summary
Windows Active Directory Remote Code Execution Vulnerability
Severity
Critical
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-20
- Improper Input Validation
Vendor Fix
10.0.17763.8644:Security Update:https://support.microsoft.com/help/5082123
https://support.microsoft.com/help/5082123
Vendor Fix
10.0.20348.5020:Security Update:https://support.microsoft.com/help/5082142
https://support.microsoft.com/help/5082142
Vendor Fix
10.0.26100.32690:Security Update:https://support.microsoft.com/help/5082063
https://support.microsoft.com/help/5082063
Vendor Fix
10.0.25398.2274:Security Update:https://support.microsoft.com/help/5082060
https://support.microsoft.com/help/5082060
Vendor Fix
10.0.14393.9060:Security Update:https://support.microsoft.com/help/5082198
https://support.microsoft.com/help/5082198
Vendor Fix
6.3.9600.23132:Monthly Rollup:https://support.microsoft.com/help/5082126
https://support.microsoft.com/help/5082126
References
Acknowledgments
<a href="https://x.com/aniqfakhrul">Aniq Fakhrul</a>
{
"document": {
"acknowledgments": [
{
"names": [
"\u003ca href=\"https://x.com/aniqfakhrul\"\u003eAniq Fakhrul\u003c/a\u003e"
]
}
],
"aggregate_severity": {
"namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
"text": "Critical"
},
"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-2026-33826 Windows Active Directory Remote Code Execution Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33826"
},
{
"category": "self",
"summary": "CVE-2026-33826 Windows Active Directory Remote Code Execution Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-33826.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 Active Directory Remote Code Execution Vulnerability",
"tracking": {
"current_release_date": "2026-04-14T07:00:00.000Z",
"generator": {
"date": "2026-04-14T16:56:51.882Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2026-33826",
"initial_release_date": "2026-04-14T07:00:00.000Z",
"revision_history": [
{
"date": "2026-04-14T07:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
}
],
"status": "final",
"version": "1"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.17763.8644",
"product": {
"name": "Windows Server 2019 \u003c10.0.17763.8644",
"product_id": "7"
}
},
{
"category": "product_version",
"name": "10.0.17763.8644",
"product": {
"name": "Windows Server 2019 10.0.17763.8644",
"product_id": "11571"
}
}
],
"category": "product_name",
"name": "Windows Server 2019"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.17763.8644",
"product": {
"name": "Windows Server 2019 (Server Core installation) \u003c10.0.17763.8644",
"product_id": "6"
}
},
{
"category": "product_version",
"name": "10.0.17763.8644",
"product": {
"name": "Windows Server 2019 (Server Core installation) 10.0.17763.8644",
"product_id": "11572"
}
}
],
"category": "product_name",
"name": "Windows Server 2019 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.20348.5020",
"product": {
"name": "Windows Server 2022 \u003c10.0.20348.5020",
"product_id": "5"
}
},
{
"category": "product_version",
"name": "10.0.20348.5020",
"product": {
"name": "Windows Server 2022 10.0.20348.5020",
"product_id": "11923"
}
}
],
"category": "product_name",
"name": "Windows Server 2022"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.20348.5020",
"product": {
"name": "Windows Server 2022 (Server Core installation) \u003c10.0.20348.5020",
"product_id": "4"
}
},
{
"category": "product_version",
"name": "10.0.20348.5020",
"product": {
"name": "Windows Server 2022 (Server Core installation) 10.0.20348.5020",
"product_id": "11924"
}
}
],
"category": "product_name",
"name": "Windows Server 2022 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.26100.32690",
"product": {
"name": "Windows Server 2025 (Server Core installation) \u003c10.0.26100.32690",
"product_id": "1"
}
},
{
"category": "product_version",
"name": "10.0.26100.32690",
"product": {
"name": "Windows Server 2025 (Server Core installation) 10.0.26100.32690",
"product_id": "12437"
}
}
],
"category": "product_name",
"name": "Windows Server 2025 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.25398.2274",
"product": {
"name": "Windows Server 2022, 23H2 Edition (Server Core installation) \u003c10.0.25398.2274",
"product_id": "3"
}
},
{
"category": "product_version",
"name": "10.0.25398.2274",
"product": {
"name": "Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2274",
"product_id": "12244"
}
}
],
"category": "product_name",
"name": "Windows Server 2022, 23H2 Edition (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.26100.32690",
"product": {
"name": "Windows Server 2025 \u003c10.0.26100.32690",
"product_id": "2"
}
},
{
"category": "product_version",
"name": "10.0.26100.32690",
"product": {
"name": "Windows Server 2025 10.0.26100.32690",
"product_id": "12436"
}
}
],
"category": "product_name",
"name": "Windows Server 2025"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.14393.9060",
"product": {
"name": "Windows Server 2016 \u003c10.0.14393.9060",
"product_id": "9"
}
},
{
"category": "product_version",
"name": "10.0.14393.9060",
"product": {
"name": "Windows Server 2016 10.0.14393.9060",
"product_id": "10816"
}
}
],
"category": "product_name",
"name": "Windows Server 2016"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c10.0.14393.9060",
"product": {
"name": "Windows Server 2016 (Server Core installation) \u003c10.0.14393.9060",
"product_id": "8"
}
},
{
"category": "product_version",
"name": "10.0.14393.9060",
"product": {
"name": "Windows Server 2016 (Server Core installation) 10.0.14393.9060",
"product_id": "10855"
}
}
],
"category": "product_name",
"name": "Windows Server 2016 (Server Core installation)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c6.3.9600.23132",
"product": {
"name": "Windows Server 2012 R2 \u003c6.3.9600.23132",
"product_id": "11"
}
},
{
"category": "product_version",
"name": "6.3.9600.23132",
"product": {
"name": "Windows Server 2012 R2 6.3.9600.23132",
"product_id": "10483"
}
}
],
"category": "product_name",
"name": "Windows Server 2012 R2"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c6.3.9600.23132",
"product": {
"name": "Windows Server 2012 R2 (Server Core installation) \u003c6.3.9600.23132",
"product_id": "10"
}
},
{
"category": "product_version",
"name": "6.3.9600.23132",
"product": {
"name": "Windows Server 2012 R2 (Server Core installation) 6.3.9600.23132",
"product_id": "10543"
}
}
],
"category": "product_name",
"name": "Windows Server 2012 R2 (Server Core installation)"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-33826",
"cwe": {
"id": "CWE-20",
"name": "Improper Input Validation"
},
"notes": [
{
"category": "general",
"text": "Microsoft",
"title": "Assigning CNA"
},
{
"category": "faq",
"text": "To exploit this vulnerability, an authenticated attacker would need to send a specially crafted RPC call to an RPC host. This could result in remote code execution on the server side with the same permissions as the RPC service.",
"title": "How could an attacker exploit this vulnerability?"
},
{
"category": "faq",
"text": "Successful exploitation of this vulnerability requires that an attacker needs to be in the same restricted Active Directory domain as the target system. The attack surface is not reachable from broader networks, which is why the attack vector is considered adjacent (AV:A).",
"title": "According to the CVSS metric, the attack vector is adjacent (AV:A). What does that mean for this vulnerability?"
}
],
"product_status": {
"fixed": [
"10483",
"10543",
"10816",
"10855",
"11571",
"11572",
"11923",
"11924",
"12244",
"12436",
"12437"
],
"known_affected": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2026-33826 Windows Active Directory Remote Code Execution Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33826"
},
{
"category": "self",
"summary": "CVE-2026-33826 Windows Active Directory Remote Code Execution Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-33826.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-14T07:00:00.000Z",
"details": "10.0.17763.8644:Security Update:https://support.microsoft.com/help/5082123",
"product_ids": [
"7",
"6"
],
"url": "https://support.microsoft.com/help/5082123"
},
{
"category": "vendor_fix",
"date": "2026-04-14T07:00:00.000Z",
"details": "10.0.20348.5020:Security Update:https://support.microsoft.com/help/5082142",
"product_ids": [
"5",
"4"
],
"url": "https://support.microsoft.com/help/5082142"
},
{
"category": "vendor_fix",
"date": "2026-04-14T07:00:00.000Z",
"details": "10.0.26100.32690:Security Update:https://support.microsoft.com/help/5082063",
"product_ids": [
"1",
"2"
],
"url": "https://support.microsoft.com/help/5082063"
},
{
"category": "vendor_fix",
"date": "2026-04-14T07:00:00.000Z",
"details": "10.0.25398.2274:Security Update:https://support.microsoft.com/help/5082060",
"product_ids": [
"3"
],
"url": "https://support.microsoft.com/help/5082060"
},
{
"category": "vendor_fix",
"date": "2026-04-14T07:00:00.000Z",
"details": "10.0.14393.9060:Security Update:https://support.microsoft.com/help/5082198",
"product_ids": [
"9",
"8"
],
"url": "https://support.microsoft.com/help/5082198"
},
{
"category": "vendor_fix",
"date": "2026-04-14T07:00:00.000Z",
"details": "6.3.9600.23132:Monthly Rollup:https://support.microsoft.com/help/5082126",
"product_ids": [
"11",
"10"
],
"url": "https://support.microsoft.com/help/5082126"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"environmentalsScore": 0.0,
"exploitCodeMaturity": "UNPROVEN",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"remediationLevel": "OFFICIAL_FIX",
"reportConfidence": "CONFIRMED",
"scope": "UNCHANGED",
"temporalScore": 7.0,
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/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",
"9",
"10",
"11"
]
}
],
"threats": [
{
"category": "impact",
"details": "Remote Code Execution"
},
{
"category": "exploit_status",
"details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely"
}
],
"title": "Windows Active Directory Remote Code Execution Vulnerability"
}
]
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
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…