EUVD-2026-73148
GHSA-4fvq-7w65-f3cp
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Malicious document delivered over network requires only user interaction to trigger parsing; full RCE yields C:H/I:H/A:H with no privilege escalation beyond user context.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
AnalysisAI
Heap-based buffer overflow in Microsoft Office Word's document parsing engine enables an unauthenticated remote attacker to achieve full code execution on a victim's system when a specially crafted Word document is opened. The flaw spans all major currently-supported Office release channels on both Windows and macOS, including Microsoft 365 Apps for Enterprise, Office 2019/2021/2024 LTSC, Word 2016, and macOS editions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | A victim must actively open or preview a specially crafted Word document in an unpatched version of Microsoft Office Word. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 (High) rating accurately reflects the threat profile: network-deliverable (AV:N), low complexity (AC:L), no authentication required (PR:N), but user interaction required (UI:R - victim must open the file). … 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 patches immediately via Windows Update, Microsoft Update Catalog, or Microsoft AutoUpdate (macOS). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: issue security alert warning users to avoid opening Word documents from untrusted sources; disable Office document preview in email clients; notify IT leadership of urgent patch deployment requirement. …
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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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