EUVD-2026-73854
GHSA-cf7w-25xq-3c4x
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-borne local execution requires victim interaction (UI:R) but no attacker privileges; full CIA impact on user session, no scope change.
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 Office Excel enables local code execution across all major Office release tracks when a victim opens a maliciously crafted spreadsheet file. The vulnerability is rooted in improper heap memory management during Excel's file parsing routines (CWE-122), resulting in full compromise of confidentiality, integrity, and availability on the victim system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that a victim user opens a specially crafted Microsoft Excel spreadsheet on an affected build of Office. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) accurately reflects a file-borne code execution primitive: low attack complexity, no prior privileges needed, but requiring the victim to open a document - a realistic and commonly achieved condition via phishing or social engineering. … 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 | The primary remediation is to apply Microsoft's official security update for each affected Office product line. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and document all systems running Microsoft Office 2016, Office 2019, Microsoft 365, or Mac Office variants, prioritizing devices with elevated access to sensitive data or critical business functions. …
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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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