EUVD-2026-73732
GHSA-5r8v-wxq7-q8cq
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-delivered document, no auth or special conditions required, user must open file; full C/I/A impact upon successful heap overflow exploitation.
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 enables remote unauthenticated attackers to achieve full code execution (C:H/I:H/A:H) by delivering a specially crafted Word document to a target user across all major Office suite versions on both Windows and macOS. Affected products span Microsoft 365 Apps for Enterprise, Office 2019, Office LTSC 2021, Office LTSC 2024, and Word 2016, with fixed version thresholds confirmed by EUVD. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target user open or sufficiently preview a specially crafted Word document in an affected, unpatched version of Microsoft Office Word. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H accurately models the threat: no network position advantage or authentication is required, and the only gating factor is user interaction - specifically, opening or previewing a malicious Word document. … 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 vendor-released patch via Microsoft Update or the Microsoft Update Catalog; exact fixed builds per EUVD are 16.0.5569.1000 for Word 2016, 16.0.20326.20138 for Microsoft 365 Apps for Enterprise, 16.0.10417.20207 for Office 2019, 16.0.14334.20906 for Office LTSC 2021, and 16.0.17932.20976 for Office LTSC 2024. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, perform an inventory of all Office deployments across Windows and macOS to identify scope and criticality tiers, prioritizing users handling sensitive data, executives, and external-facing roles. …
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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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