EUVD-2026-73873
GHSA-fh6c-h467-qhhf
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-triggered local exploit requires no system privileges but mandates user interaction to open the malicious workbook; full code execution justifies C:H/I:H/A:H.
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 execute code locally.
AnalysisAI
Out-of-bounds read in Microsoft Excel's file-parsing engine allows code execution when a victim opens a specially crafted workbook. Affected builds span Excel 2016 through Office LTSC 2024 and their Mac equivalents, making the exposure broad across both perpetual-license and subscription deployments. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must actively open a specially crafted Excel file - exploitation cannot occur without this user interaction (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) is consistent with a file-format exploitation scenario: the attack is local because the victim must open the malicious workbook, but no system-level privileges are required and complexity is low once the file is delivered. … 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 standard Microsoft Update channels. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Excel installations across the enterprise (Excel 2016, Excel 2019, Microsoft 365, and Office LTSC 2024) and prioritize systems handling external documents. …
Sign in for detailed remediation steps and compensating controls.
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Information Disclosure
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External POC / Exploit Code
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