EUVD-2026-73840
GHSA-pj2x-w85v-3ph9
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Document delivered over network (AV:N), no attacker auth needed (PR:N), user must open file (UI:R); full code execution yields C:H/I:H/A:H within user scope (S:U).
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 unauthenticated remote attackers to achieve arbitrary code execution at the privilege level of the target user. The vulnerability (CWE-122) is triggered when a victim opens a specially crafted Word document, covering Word 2016, Office 2019, Office LTSC 2021/2024, and Microsoft 365 Apps for Enterprise across both Windows and Mac platforms. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must open a specially crafted Word document using an unpatched version of Microsoft Word or the Word component bundled with Microsoft Office (2016, 2019, LTSC 2021, LTSC 2024, 365 Apps for Enterprise, or the corresponding Mac variants). … 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 reflects the threat model: any unauthenticated attacker can deliver a malicious Word file over the network, and a single user click results in full code execution. … 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 via Microsoft Update or Microsoft 365 Admin Center immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Microsoft Office installations (Word 2016, Office 2019, Office LTSC 2021/2024, Microsoft 365 Apps) using asset management and patch-management systems to establish baseline coverage and identify high-risk user populations. …
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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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