EUVD-2026-73657
GHSA-wqvg-7243-2q7j
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only LPE via heap overflow needing only a standard user account; AC:L as no special conditions stated; full CIA reflects SYSTEM-level privilege gain.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Core Messaging allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via heap-based buffer overflow in Windows Core Messaging affects a broad range of Windows 10, Windows 11, and Windows Server releases (2016 through 2025). A low-privileged local attacker can trigger the overflow through a malformed IPC message to achieve full SYSTEM-level access (C:H/I:H/A:H) without user interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a low-privileged (standard user) authenticated local session on an affected Windows system - consistent with CVSS PR:L and AV:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 (High) vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H accurately characterizes this as a reliable local privilege escalation: low attack complexity means no race conditions or heap grooming gymnastics are required, and PR:L confirms only a standard user account is needed - no administrator privileges. … 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 Microsoft's cumulative security update for each affected Windows SKU to bring builds to or above the thresholds listed in the affected versions (e.g., Windows Server 2025 to 10.0.26100.33438, Windows 11 24H2 to 10.0.26100.9445, Windows Server 2022 to 10.0.20348.5622). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, Windows 11, and Windows Server systems (2016 through 2025) in your environment and flag those supporting critical business operations or housing sensitive data for priority patching. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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