EUVD-2026-73218
GHSA-p3m8-4x8j-2j8w
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network vector and no-auth (PR:N) confirmed by description; AC:H reflects required heap grooming complexity; full CIA impact (H/H/H) consistent with arbitrary code execution.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft JScript allows an unauthorized attacker to execute code over a network.
AnalysisAI
Heap-based buffer overflow in the Microsoft JScript scripting engine enables unauthenticated remote code execution across a broad range of Windows client and server platforms. The flaw (CWE-122) resides in the legacy JScript engine bundled with Windows 10, Windows 11, and Windows Server 2012 R2 through 2025, exposing systems to full confidentiality, integrity, and availability compromise without requiring user interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CVSS vector (AV:N/AC:H/PR:N/UI:N) establishes that exploitation is network-reachable, requires no authentication and no user interaction, but demands high attack complexity. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 8.1 with vector AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H reflects a high-severity flaw where full system compromise is theoretically achievable over the network without authentication or user interaction, but only under high attack complexity conditions. … 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 security updates per the EUVD version data to bring each build to its patched level: Windows 10 21H2 to 10.0.19044.7725 or later, Windows 10 22H2 to 10.0.19045.7725 or later, Windows 11 23H2 to 10.0.22631.7582 or later, Windows 11 24H2/Server 2025 to 10.0.26100.9445 or 10.0.26100.33438 or later, Windows 11 25H2 to 10.0.26200.9445 or later, Windows 11 26H1 to 10.0.28000.2954 or later, Windows Server 2016 to 10.0.14393.9512 or later, Windows Server 2019 to 10.0.17763.9245 or later, Windows Server 2022 to 10.0.20348.5622 or later, and Windows Server 2012 R2 to 6.3.9600.23397 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, Windows 11, and Windows Server 2012 R2 through 2025 systems to determine exposure scope and prioritize critical infrastructure. …
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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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