EUVD-2026-73874
GHSA-9364-4fc6-28wr
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local vector because exploitation is triggered by opening a crafted file; PR:N as attacker needs no prior system access; UI:R mandatory file-open; full CIA impact on the Office process.
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 local code execution when a user opens a specially crafted workbook, affecting all major Office product lines from Excel 2016 through Office LTSC 2024 and Microsoft 365 Apps for Enterprise on both Windows and Mac platforms. The vulnerability carries a CVSS 7.8 score reflecting high CIA impact against the Office process, with mandatory user interaction (opening the malicious file) as the sole prerequisite. …
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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 workbook (.xls, .xlsx, or related format) using an affected, unpatched version of Microsoft Office Excel - confirmed by CVSS AV:L/UI:R. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score accurately characterizes the real-world risk profile: AV:L reflects the file-open trigger (not a network-reachable service), AC:L indicates no exploitation complexity beyond persuading a user to open the file, UI:R is the hard prerequisite, and S:U confirms no automatic OS-level privilege escalation. … 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 security update via Windows Update, Microsoft Update, or the Microsoft 365 admin portal. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Microsoft Office installations to identify affected versions (Excel 2016, Excel 2019, Office 2021, Office LTSC 2024, and Microsoft 365 Apps for Enterprise on both Windows and Mac), and flag systems used by high-value targets and sensitive data handlers for priority patching. …
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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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