EUVD-2026-73861
GHSA-f8m7-3hf4-56mm
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Local file-open trigger (AV:L/UI:R), no privileges needed to open a file (PR:N), pure read-path flaw so I:N/A:N; C:H reflects potential heap disclosure.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
AnalysisAI
Type confusion (CWE-843) in Microsoft Office Excel enables local information disclosure when a victim opens a specially crafted Excel file. Affected products span Excel 2016, Office 2019, Office LTSC 2021/2024, Microsoft 365 Apps for Enterprise, Office Online Server, and multiple Mac Office variants. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must open a specially crafted Excel workbook on a local system running a vulnerable Office build. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is moderate. … 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 for each affected product train via Windows Update, Microsoft Update, or Click-to-Run update channels. … 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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