EUVD-2026-73860
GHSA-pg22-g362-3mr2
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Local file-open trigger with user interaction; no privileges needed; only confidentiality impacted via uninitialized memory read.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
AnalysisAI
Uninitialized memory disclosure in Microsoft Excel exposes potentially sensitive heap or stack contents when a victim opens a crafted document, allowing an unauthenticated attacker to read process memory with high confidentiality impact. Affected product lines span Excel 2016 through Microsoft 365 Apps for Enterprise and multiple Mac variants, making this a broad-surface vulnerability. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must open a specially crafted Excel document (AV:L/UI:R), which requires user interaction - typically social engineering or a phishing delivery mechanism. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.5 (Medium) reflects a local, user-interaction-dependent attack with no integrity or availability impact - the sole consequence is 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 Microsoft's patch via Windows Update or the Microsoft Update Catalog, targeting the following minimum fixed builds: Excel/Office 2016 → 16.0.5569.1003; Office 2019 → 16.0.10417.20204; Office LTSC 2021 → 16.0.14334.20896; Office LTSC 2024 → 16.0.17932.20960; Microsoft 365 Apps for Enterprise → 16.0.20326.20136. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-908 – Use of Uninitialized Resource
View allSame technique Information Disclosure
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External POC / Exploit Code
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