EUVD-2026-56598
GHSA-g2jf-qq7c-f2qj
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low privileges match an authorized local user abusing the elevated Installer service; SYSTEM-level escalation justifies full C/I/A:H with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Stack-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges locally.
AnalysisAI
Stack-based buffer overflow in the Windows Installer component (msiexec) enables local privilege escalation to SYSTEM on affected Windows systems. An attacker holding any standard local user account can trigger the overflow with low complexity and no user interaction required, achieving full compromise of confidentiality, integrity, and availability. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid local user account on the target system - the CVSS PR:L metric confirms that at least low-privileged authenticated local access is a prerequisite; unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 rating (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately captures a well-understood threat model: a low-privileged local account is sufficient, no special configuration is required, and the impact is full CIA compromise at SYSTEM level. … 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 for CVE-2026-70346 as soon as it is released; the definitive patch version and affected product list are available at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70346. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct full inventory of Windows systems running msiexec to determine organizational exposure scope. …
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External POC / Exploit Code
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