EUVD-2026-73569
GHSA-3m3q-63xj-gjcr
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack vector with low privileges required confirmed by 'authorized attacker elevates privileges locally'; no user interaction; full C/I/A on the compromised host.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
6DescriptionCVE.org
Improper encoding or escaping of output in Active Directory Certificate Services (AD CS) allows an authorized attacker to elevate privileges locally.
Articles & Coverage 1
AnalysisAI
Local privilege escalation in Active Directory Certificate Services (AD CS) on Windows enables an authenticated low-privileged user to gain full system control (C:H/I:H/A:H) without user interaction. The root cause is CWE-116 - improper encoding or escaping of output - within the AD CS component, which Microsoft has patched across a broad range of Windows 10 and Windows Server releases from 2012 through 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must have an authenticated low-privileged session on the affected host - specifically a machine running the Active Directory Certificate Services role. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score is well-calibrated: AV:L requires the attacker to already have local code execution, PR:L confirms a low-privileged authenticated account is sufficient, and the C:H/I:H/A:H triad reflects a complete local privilege escalation to SYSTEM or equivalent. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft security update corresponding to the affected Windows build via Windows Update or WSUS; the vendor has confirmed a patch is available (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69821). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 and Windows Server systems (2012 through 2025 releases) in your environment, prioritizing domain-joined machines and those running AD CS roles. …
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Same weakness CWE-116 – Improper Encoding or Escaping of Output
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External POC / Exploit Code
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