EUVD-2026-73863
GHSA-57f5-cgpg-3p8c
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File parsed locally after user opens it (AV:L/UI:R); no target-system privileges required (PR:N); full code execution yields C:H/I:H/A:H with unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Stack-based buffer overflow in Microsoft Office Excel enables arbitrary code execution at the current user's privilege level when a victim opens a specially crafted workbook file. The vulnerability spans Excel 2016 through Microsoft 365 Apps for Enterprise and LTSC 2024 across both Windows and Mac platforms, making the potential victim population extremely large. …
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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 workbook file - this is the sole required trigger (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High rating (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) accurately represents a document-based code execution path that requires user interaction - opening a malicious file - but no system privileges or special access on the target machine. … 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 for the appropriate Office track via Microsoft Update, Microsoft 365 Admin Center, or enterprise patch management tooling. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Excel versions in use across Windows and Mac endpoints to establish baseline exposure and identify systems requiring prioritization. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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