EUVD-2026-56597
GHSA-mmrv-896m-g74r
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack vector and low-privilege requirement reflect standard user triggering the SYSTEM-running Installer service; full CIA impact reflects SYSTEM-level code execution with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows Installer exposes all supported Windows systems to SYSTEM-level compromise by any low-privileged local user. The heap-based buffer overflow (CWE-122) in the Installer service requires only an authenticated local session - no user interaction, no elevated credentials, and low attack complexity per CVSS:3.1/AV:L/AC:L/PR:L/UI:N. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid low-privileged local user account on the target Windows system, as confirmed by the CVSS vector (AV:L/PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.8 with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H represents a high-severity, locally exploitable privilege escalation with no meaningful barriers beyond an active low-privilege user session - no special configuration, no elevated credentials, and no user interaction are required. … 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-2026-70345 via Windows Update, Windows Server Update Services (WSUS), or the Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Enable Windows Installer service logging and conduct an urgent audit of local account access controls across all Windows systems to identify and document accounts with local logon privileges. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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