EUVD-2026-73864
GHSA-j54p-243v-v67x
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Local file-open delivery (AV:L, UI:R) with no privileges required; out-of-bounds read yields confidentiality impact only, no write or crash 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 Excel across Office 2016 through 365 Apps for Enterprise permits a local, unauthenticated attacker to disclose sensitive memory contents when a victim opens a specially crafted spreadsheet file. The vulnerability carries a CVSS 5.5 score reflecting the local delivery requirement and confidentiality-only impact, with no integrity or availability consequences. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to open a specially crafted Excel file on an unpatched version of Microsoft Excel or Office - reflected in the CVSS UI:R metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.5 medium rating reflects an accurate balance of the local delivery constraint (AV:L), required user interaction (UI:R), and high confidentiality impact (C:H). … 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 Microsoft 365 Admin Center. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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