EUVD-2026-56728
GHSA-mcm8-2vx8-c98r
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low-privilege requirement align with description of an authorized local attacker; heap overflow achieving SYSTEM access justifies full C/I/A impact without 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
Local privilege escalation in Windows Installer (msiexec) enables an authenticated low-privileged user to trigger a heap-based buffer overflow, potentially achieving SYSTEM-level code execution across a broad range of Windows client and server platforms spanning over a decade of releases. Affected systems include Windows 10 through Windows 11 25H2 and Windows Server 2012 through Server 2025, making the exposure surface extensive across enterprise and consumer deployments. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the attacker hold an authorized, authenticated local user account on the target system - this is reflected in the CVSS vector as PR:L (low privileges required). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 base score (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) is well-calibrated: the low attack complexity and absence of required user interaction make the vulnerability straightforward to exploit once a local foothold exists, while the local attack vector (AV:L) is the primary limiting factor constraining opportunistic internet-scale exploitation. … 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 vendor-released patches from Microsoft via Windows Update, WSUS, or Microsoft Update Catalog; exact fixed build numbers per product are documented in ENISA EUVD-2026-56728 and the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65774. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, obtain the Windows Installer security update from the Microsoft Security Response Center and map affected Windows 10, 11, and Server systems in your environment. …
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External POC / Exploit Code
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