EUVD-2026-73827
GHSA-jvxv-cm64-fc4m
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network delivery via document, no attacker privileges, low complexity; user must open file (UI:R); full code execution yields C:H/I:H/A:H.
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 remote unauthenticated attackers to execute arbitrary code on target systems when a user opens a specially crafted document. The vulnerability affects a wide range of Microsoft Office releases - Word 2016, Office 2019, LTSC 2021, LTSC 2024, Office 365 for Mac, and Microsoft 365 Apps for Enterprise - making the attack surface extremely broad. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target user to open a specially crafted Office document (e.g., via email attachment, web download, or shared document link) using an unpatched version of Microsoft Word or an affected Office suite. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 8.8 with vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H accurately characterizes this as a high-severity, low-friction attack. … 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 patches for all affected products immediately via Microsoft Update or Microsoft 365 Admin Center. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and catalog all Microsoft Office deployments in your environment, focusing on the affected versions: Word 2016, Office 2019, LTSC 2021, LTSC 2024, Office 365 for Mac, and Microsoft 365 Apps for Enterprise. …
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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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