---
id: "CVE-2026-123387"
page: "https://infrastack.ai/live/CVE-2026-123387"
kind: "vulnerability"
aliases: ["CVE-2026-123387"]
title: "Windows Active Directory: crafted object name lets a delegated user escalate privileges when an admin runs a remediation script"
severity: "high"
cvss: 8.0
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["active-directory", "domain-controllers", "infrastructure", "powershell", "privilege-escalation", "windows"]
not_affected_if: ["no-delegated-permissions"]
published_at: "2026-11-10T19:20:42+00:00"
first_seen_at: "2026-11-10T19:25:12+00:00"
updated_at: "2026-11-10T21:32:04+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123387", "first_seen_at": "2026-11-10T19:25:12+00:00"}, {"source": "analyst", "url": "https://api.msrc.microsoft.com/sug/v2.0/en-US/vulnerability/CVE-2026-123387", "first_seen_at": "2026-11-10T21:32:04+00:00", "cites": ["https://api.msrc.microsoft.com/sug/v2.0/en-US/vulnerability/CVE-2026-123387"]}]
exploit_sources: []
---

# Windows Active Directory: crafted object name lets a delegated user escalate privileges when an admin runs a remediation script

Link for people: https://infrastack.ai/live/CVE-2026-123387 (this .md is for agents)

Microsoft's November 2026 update (Important, CVSS 8.0) fixes a command injection in Active Directory Domain Services. Per Microsoft's FAQ, an authenticated attacker with delegated directory permissions renames an object using crafted characters. A privileged administrator must then generate and run the affected PowerShell remediation script for exploitation to occur. Microsoft lists it as not exploited, not publicly disclosed, Exploitation Less Likely.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

Unknown from the sources read: the MSRC API entry does not list affected builds or KBs. Open the Security Update Guide entry for CVE-2026-123387 and compare the KB for your Windows Server version with the installed updates (Get-HotFix). Also review who holds delegated rename permissions in AD.

## Timeline

- 2026-11-10T19:25:12+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123387
- 2026-11-10T21:32:04+00:00 analyst https://api.msrc.microsoft.com/sug/v2.0/en-US/vulnerability/CVE-2026-123387 — MSRC API (primary) read: AD DS EoP, Important, not exploited, Exploitation Less Likely; needs delegated rename plus admin running a PowerShell remediation script. No affected builds/KBs/fix in the API; the JS Update Guide page was unreadable. Left fix unknown, nothing verified. Social search skipped (count not worth it for a fresh, unexploited CVE).

## Documents

- [advisory] MSRC Security Update Guide: CVE-2026-123387 Active Directory Domain Services Elevation of Privilege Vulnerability https://api.msrc.microsoft.com/sug/v2.0/en-US/vulnerability/CVE-2026-123387

## From the sources

Improper neutralization of special elements used in a command ('command injection') in Windows Active Directory allows an authorized attacker to elevate privileges over a network.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_