EUVD-2026-73831
GHSA-cx9w-4crx-cwpr
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-delivered document exploit requiring only user interaction; no privileges needed; full triad impact on user-context process with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Out-of-bounds write in Microsoft Office allows an unauthorized attacker to execute code over a network.
AnalysisAI
Out-of-bounds write (CWE-787) in multiple Microsoft Office versions enables remote code execution when a victim opens a specially crafted Office document. The vulnerability affects a broad matrix of products spanning Microsoft 365 Apps for Enterprise, Office LTSC 2021/2024, Office 2016/2019, and their Mac counterparts, covering virtually the entire modern Office product line. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | User interaction is required: the victim must open a specially crafted Office document (consistent with CVSS UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score reflects a realistic and significant threat: network delivery, low attack complexity, no required privileges, and full confidentiality/integrity/availability impact upon a single user interaction. … 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 vendor-released patches via Microsoft Update or the Microsoft Update Catalog; fixed builds are 16.0.14334.20896 (Office LTSC 2021), 16.0.20326.20136 (Microsoft 365 Apps for Enterprise), 16.0.5569.1000 (Office 2016), 16.0.10417.20204 (Office 2019), and 16.0.17932.20960 (Office LTSC 2024). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all deployed Office versions (365, LTSC 2021/2024, 2016/2019, and Mac) across corporate and BYOD endpoints and confirm MSRC patch availability; declare elevated patch priority and reserve deployment resources. …
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Buffer Overflow
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External POC / Exploit Code
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