EUVD-2026-73876
GHSA-88w6-wqwh-8h42
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File must be locally opened (AV:L); no attacker privileges on target required (PR:N); victim must actively open the crafted file (UI:R); successful exploitation yields full code execution (C:H/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Heap-based buffer overflow in Microsoft Excel enables local code execution with full user-level privileges when a victim opens a specially crafted workbook file. Affected products span the entire current Office portfolio - Excel 2016 through Office LTSC 2024 and 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 file on a system running an unpatched version of Microsoft Excel or an Office suite that includes Excel. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) accurately reflects the risk profile: low complexity, no attacker-side privileges required, but mandatory user interaction and a local attack vector constrain opportunistic mass 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 | Apply the vendor-released security update immediately via Microsoft Update, Windows Update for Business, or the Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within the first 24 hours, conduct an inventory of all systems running Excel 2016, Excel 2019, Office LTSC 2024, or Microsoft 365 Apps for Enterprise to assess patch deployment readiness and identify any technical constraints such as administrative access requirements or compatibility concerns. …
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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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