EUVD-2026-73858
GHSA-732g-6c4x-qqjr
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Local file-open trigger with mandatory user interaction; no privileges required from attacker; impact is confidentiality-only memory disclosure with no write primitive.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
AnalysisAI
Out-of-bounds read in Microsoft Office Excel's file parser allows local information disclosure when a victim opens a specially crafted workbook. Affecting Excel 2016 through Microsoft 365 Apps for Enterprise, Office LTSC 2024, Office Online Server, and multiple macOS Office variants, the vulnerability (CWE-125) exposes process memory with high confidentiality impact but no integrity or availability consequences. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim opens a specially crafted Excel workbook using one of the affected Microsoft Office builds; the attack cannot be triggered remotely without this user action (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.5 score accurately reflects the constrained threat model: AV:L requires a file to be opened on the local system, UI:R makes the attack non-automatable, and impact is C:H with I:N/A:N - pure memory disclosure with no write primitive. … 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 Microsoft's update via Windows Update, Microsoft Update Catalog, or Microsoft AutoUpdate (macOS) per the advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81390. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Information Disclosure
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External POC / Exploit Code
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