EUVD-2026-56395
GHSA-6742-hp99-qw48
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network attack vector and PR:L confirmed by description's 'authorized attacker over a network'; full C/I/A impact is consistent with arbitrary code execution; scope unchanged as exploitation is confined to the AD CS host.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Active Directory Certificate Services (AD CS) allows an authorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Active Directory Certificate Services (AD CS) is achievable by low-privileged authenticated network attackers through a use-after-free (CWE-416) memory corruption flaw. All supported Windows Server versions from 2012 through 2025 are affected, along with Windows 10 versions 1607 and 1809. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must possess at least one valid low-privilege domain account (CVSS PR:L) and must have network connectivity to the AD CS server. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 8.8 (High) is well-supported by the AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H vector: the flaw is network-reachable, requires no special conditions or user interaction, and demands only low-privilege credentials - a bar easily met by any domain-authenticated user in a typical enterprise. … 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 | The primary fix is to apply Microsoft's security update for each affected platform as detailed in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62818. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an inventory of all AD CS deployments and their Windows Server versions (2012, 2012 R2, 2016, 2019, 2022, 2025) and Windows 10 versions (1607, 1809) to determine exposure scope. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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