EUVD-2026-73834
GHSA-q9v2-x5h4-hmx2
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network delivery of a crafted document requires no auth (PR:N), user must open the file (UI:R), heap overflow yields full code execution with complete C/I/A impact.
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
Remote code execution in Microsoft Office Word via a heap-based buffer overflow (CWE-122) allows an unauthenticated network attacker to fully compromise a victim system upon opening a crafted document. All major Office licensing tracks are affected on both Windows and macOS, spanning Office 2016 through Microsoft 365 Apps for Enterprise. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must open a crafted Word document (.doc, .docx, or a related format triggering the vulnerable parser path) using a vulnerable version of Microsoft Office Word on Windows or macOS. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score accurately reflects the risk profile: AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H signals broad weaponizability with the sole friction point being the UI:R gate requiring the victim to open a 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 Microsoft's released patches through Windows Update, Microsoft Update Catalog, or Microsoft 365 admin center. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Office deployments across Windows and macOS systems to identify instances of Office 2016 and Microsoft 365 Apps for Enterprise. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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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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