EUVD-2026-73870
GHSA-q7rq-9gf9-qx96
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
File-based local disclosure; no attacker privileges needed, but user must open the crafted document; no integrity or availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Exposure of sensitive system information to an unauthorized control sphere in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
AnalysisAI
Sensitive system information disclosure in Microsoft Excel allows a local, unauthenticated attacker to read high-confidentiality data when a victim opens a specially crafted spreadsheet. Affecting Office 2016 through LTSC 2024 on both Windows and Mac, the flaw (CWE-497) exposes internal system data - such as memory layout, environment variables, or path information - to an unauthorized control sphere during file parsing. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a user to open a specially crafted Excel file on a system running an unpatched version of Microsoft Excel (Office 2016, 2019, LTSC 2021, LTSC 2024, 365 Apps for Enterprise, or a Mac variant). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | With a CVSS 5.5 score and AV:L/UI:R, real-world exploitation depends entirely on file delivery - typically spear-phishing. … 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 via Windows Update or the Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same technique Information Disclosure
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External POC / Exploit Code
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