EUVD-2026-73859
GHSA-3g7p-8qpr-9q7v
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
AV:L because file must be opened locally; UI:R for mandatory user interaction; PR:N as no privilege needed; C:H for meaningful memory disclosure; no integrity or availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
AnalysisAI
Buffer over-read (CWE-126) in Microsoft Office Excel allows a local attacker to disclose potentially sensitive process memory when a user opens a crafted Excel workbook. The flaw spans a broad range of Office versions from 2016 through LTSC 2024, including Microsoft 365 Apps for Enterprise and Mac variants, making the affected footprint very large. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local user to open a specially crafted Excel workbook on an unpatched system - the UI:R metric confirms mandatory user interaction. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 5.5 Medium with vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N reflects a realistic, contained threat profile. … 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 Microsoft Security Update available via the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81399. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-126 – Buffer Over-read
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External POC / Exploit Code
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