EUVD-2026-73315
GHSA-96qx-7xj2-vx4x
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Malicious file delivered over network, no attacker privileges required, victim must open the file (UI:R), full C/I/A impact on exploitation; vendor vector assessment is sound.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
AnalysisAI
Out-of-bounds read in Microsoft Office Excel enables remote code execution when a victim opens a crafted Excel workbook, achieving full C/I/A compromise on the target system. The vulnerability spans every major Office product line from Excel 2016 through Microsoft 365 Apps for Enterprise on both Windows and macOS. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must open a specially crafted Excel workbook using any unpatched version of Microsoft Excel across the affected Windows or macOS product lines (Excel 2016 through Microsoft 365 Apps for Enterprise at affected build levels). … 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: an unauthenticated attacker with no existing account or system privileges achieves full confidentiality, integrity, and availability compromise upon successful exploitation. … 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 | Vendor-released patches are available for all Windows product lines; apply the latest cumulative update for your Office servicing channel via Microsoft Update or the Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all Excel 2016, 2019, and Microsoft 365 Apps installations across Windows and macOS; prioritize systems handling external files or connected to email. …
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-20 – Improper Input Validation
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
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