EUVD-2026-73879
GHSA-w4v5-wpvp-4gfm
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-triggered local parse overflow requires no privileges and no special config, but mandates victim interaction; full C/I/A impact upon successful exploitation.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Stack-based buffer overflow in Microsoft Office Excel enables arbitrary code execution when a user opens a specially crafted workbook. The vulnerability (CWE-121) spans a wide range of Office suites from 2016 through 2024 LTSC on both Windows and macOS. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must actively open a specially crafted Excel workbook file; exploitation cannot be triggered without this user interaction (UI:R per CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.8 High with vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H accurately captures the threat model: exploitation is straightforward once a file is delivered (AC:L, PR:N), but mandates user interaction (UI:R), which is the primary friction point. … 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 the Office update channel as appropriate for your deployment. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Microsoft Excel deployments (Office 2016, 2019, 2021, 2024, and Microsoft 365 Apps for Enterprise) and identify users in finance, executive, legal, and data-handling roles with external communication access. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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