EUVD-2026-73503
GHSA-8cm8-xwcp-r933
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with standard user credentials sufficient; no interaction or special conditions needed; full CIA impact upon successful privilege escalation.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Error Reporting allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in Windows Error Reporting (WER) enables a locally authenticated attacker to escalate privileges to SYSTEM or administrative level on affected Windows endpoints and servers. The vulnerability spans virtually the entire supported Windows ecosystem - from Windows 10 1607 and Server 2016 through Windows 11 26H1 and Server 2025 - making the blast radius exceptionally broad. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid local user account on the target Windows system (PR:L - 'authorized attacker' per the description), meaning anonymous or remote unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.8 (High) with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H accurately reflects a reliable local privilege escalation with full CIA 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 | Apply the Microsoft security update corresponding to your Windows version via Windows Update or WSUS, targeting the patched builds listed in the affected versions: 10.0.14393.9512 or later for Windows 10 1607/Server 2016, 10.0.17763.9245 or later for Windows 10 1809/Server 2019, 10.0.19044.7725/10.0.19045.7725 or later for Windows 10 21H2/22H2, 10.0.20348.5622 or later for Windows Server 2022, 10.0.22631.7582 or later for Windows 11 23H2, 10.0.26100.9445 or later for Windows 11 24H2/Server 2025, 10.0.26200.9445 or later for Windows 11 25H2, and 10.0.28000.2954 or later for Windows 11 26H1. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Windows 10, 11, Server 2016, and Server 2025 systems in your environment using existing vulnerability scanning or asset inventory tools; prioritize servers and workstations running sensitive services. …
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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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