EUVD-2026-73240
GHSA-5wcv-84v4-wh3q
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-delivered document triggers local overflow with no attacker auth required; single user interaction (file open) is the only barrier; full CIA impact on victim system.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
AnalysisAI
Stack-based buffer overflow in Microsoft Office Word's document parsing engine allows remote unauthenticated attackers to execute arbitrary code with the privileges of the victim user when a specially crafted Word document is opened. The flaw (CWE-121) spans Microsoft 365 Apps for Enterprise, Office 2019, Office LTSC 2021, Office LTSC 2024, and Word 2016 on both Windows and macOS. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to actively open a specially crafted Word document, satisfying the UI:R condition in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) reflects a high-severity network-reachable vulnerability requiring no attacker privileges and delivering complete confidentiality, integrity, and availability compromise on the vulnerable system. … 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 security updates through Windows Update, Microsoft Update Catalog, or the Microsoft 365 admin portal. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all systems running Microsoft 365 Apps for Enterprise, Office 2019, Office LTSC 2021, Office LTSC 2024, and Word 2016 (Windows and macOS) and block opening Word documents from untrusted external sources via email controls or endpoint security policies. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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