EUVD-2026-73733
GHSA-hh7h-258w-8hwv
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Network-delivered crafted file requires user to open it (UI:R, PR:N); read-only memory disclosure means I:N and A:N with no scope change.
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 over a network.
AnalysisAI
Buffer over-read (CWE-126) in Microsoft Office Excel's file parsing engine allows remote information disclosure when a user opens a crafted spreadsheet file. Affected versions span Office 2016 through Office 2024 LTSC and Microsoft 365 Apps for Enterprise across Windows and Mac platforms, with fixed builds confirmed for Windows variants per EUVD-2026-73733. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that a user actively open a crafted Excel file in an unpatched version of Microsoft Office Excel (UI:R per CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.5 score appropriately reflects a medium-severity, information-disclosure-only finding: network-reachable delivery (AV:N), low complexity (AC:L), no attacker privileges required (PR:N), but mandatory user interaction (UI:R) and confidentiality-only impact (C:H, I:N, A:N) meaningfully bound real-world risk. … 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 released patches through standard Office update channels or the Microsoft Update Catalog. … 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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