Summary
Impact: Remote Code Execution. Microsoft rating: Critical. Not known to be exploited — Exploitation More Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
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.
According to the CVSS metric, the attack vector is adjacent (AV:A). What does that mean for this vulnerability?
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).
Security updates
10.0.17763.8644 — https://support.microsoft.com/help/5082123
10.0.20348.5020 — https://support.microsoft.com/help/5082142
10.0.26100.32690 — https://support.microsoft.com/help/5082063
10.0.25398.2274 — https://support.microsoft.com/help/5082060
10.0.14393.9060 — https://support.microsoft.com/help/5082198
6.3.9600.23132 — https://support.microsoft.com/help/5082126
Vulnerabilities 1
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High 8.0CVE-2026-33826 Public exploit
Windows Active Directory Remote Code Execution Vulnerability
Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.
Revision history
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#1
Information published.
References
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CVE-2026-33826 Windows Active Directory Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33826
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss