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
Affected products
Fixed
11 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows Server 2012 R2 6.3.9600.23132
Windows Server 2012 R2
|
6.3.9600.23132 | ||
|
Windows Server 2012 R2 (Server Core installation) 6.3.9600.23132
Windows Server 2012 R2 (Server Core installation)
|
6.3.9600.23132 | ||
|
Windows Server 2016 10.0.14393.9060
Windows Server 2016
|
10.0.14393.9060 | ||
|
Windows Server 2016 (Server Core installation) 10.0.14393.9060
Windows Server 2016 (Server Core installation)
|
10.0.14393.9060 | ||
|
Windows Server 2019 10.0.17763.8644
Windows Server 2019
|
10.0.17763.8644 | ||
|
Windows Server 2019 (Server Core installation) 10.0.17763.8644
Windows Server 2019 (Server Core installation)
|
10.0.17763.8644 | ||
|
Windows Server 2022 10.0.20348.5020
Windows Server 2022
|
10.0.20348.5020 | ||
|
Windows Server 2022 (Server Core installation) 10.0.20348.5020
Windows Server 2022 (Server Core installation)
|
10.0.20348.5020 | ||
|
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2274
Windows Server 2022, 23H2 Edition (Server Core installation)
|
10.0.25398.2274 | ||
|
Windows Server 2025 10.0.26100.32690
Windows Server 2025
|
10.0.26100.32690 | ||
|
Windows Server 2025 (Server Core installation) 10.0.26100.32690
Windows Server 2025 (Server Core installation)
|
10.0.26100.32690 |
Known affected
11 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows Server 2025 (Server Core installation) <10.0.26100.32690
Windows Server 2025 (Server Core installation)
|
<10.0.26100.32690 |
Vendor Fix
fix
|
|
|
Windows Server 2025 <10.0.26100.32690
Windows Server 2025
|
<10.0.26100.32690 |
Vendor Fix
fix
|
|
|
Windows Server 2022, 23H2 Edition (Server Core installation) <10.0.25398.2274
Windows Server 2022, 23H2 Edition (Server Core installation)
|
<10.0.25398.2274 |
Vendor Fix
fix
|
|
|
Windows Server 2022 (Server Core installation) <10.0.20348.5020
Windows Server 2022 (Server Core installation)
|
<10.0.20348.5020 |
Vendor Fix
fix
|
|
|
Windows Server 2022 <10.0.20348.5020
Windows Server 2022
|
<10.0.20348.5020 |
Vendor Fix
fix
|
|
|
Windows Server 2019 (Server Core installation) <10.0.17763.8644
Windows Server 2019 (Server Core installation)
|
<10.0.17763.8644 |
Vendor Fix
fix
|
|
|
Windows Server 2019 <10.0.17763.8644
Windows Server 2019
|
<10.0.17763.8644 |
Vendor Fix
fix
|
|
|
Windows Server 2016 (Server Core installation) <10.0.14393.9060
Windows Server 2016 (Server Core installation)
|
<10.0.14393.9060 |
Vendor Fix
fix
|
|
|
Windows Server 2016 <10.0.14393.9060
Windows Server 2016
|
<10.0.14393.9060 |
Vendor Fix
fix
|
|
|
Windows Server 2012 R2 (Server Core installation) <6.3.9600.23132
Windows Server 2012 R2 (Server Core installation)
|
<6.3.9600.23132 |
Vendor Fix
fix
|
|
|
Windows Server 2012 R2 <6.3.9600.23132
Windows Server 2012 R2
|
<6.3.9600.23132 |
Vendor Fix
fix
|
Threats
Impact
Remote Code Execution
Exploit Status
Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely
References
7 references
Acknowledgments
<a href="https://x.com/aniqfakhrul">Aniq Fakhrul</a>
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"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.",
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"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"
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"title": "Windows Active Directory Remote Code Execution Vulnerability",
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"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": {
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"10816",
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"11572",
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"11924",
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"known_affected": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11"
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{
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"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-33826.json"
}
],
"remediations": [
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"date": "2026-04-14T07:00:00.000Z",
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"8"
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{
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"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"
}
]
}
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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.
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