EUVD-2026-56596
GHSA-j9x6-f8wv-3cg5
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low privileges confirmed by description ('authorized attacker, locally'); full C/I/A impact consistent with privilege escalation to SYSTEM.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Stack-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Installer (msiexec) stems from a stack-based buffer overflow (CWE-121) exploitable by any authenticated local user. An attacker with low-privilege access on an affected Windows system can trigger the overflow to gain full SYSTEM-level control, achieving complete confidentiality, integrity, and availability compromise of the local host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authorized (authenticated) local user account - the CVSS vector PR:L confirms low-privilege authentication is sufficient, meaning any standard domain or local user qualifies. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H yields a score of 7.8, reflecting a local attack with low complexity and low privilege requirements that achieves full impact. … 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 remediation is to apply the Microsoft security update addressing CVE-2026-70344, available through the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70344. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows systems running affected versions of msiexec and restrict local logon capabilities to authorized personnel only. …
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External POC / Exploit Code
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