EUVD-2026-73853
GHSA-x633-79vf-vxw3
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-open trigger mandates UI:R and AV:L; no attacker privileges needed; heap corruption enabling code execution justifies C:H/I:H/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Heap-based buffer overflow in Microsoft Office Excel enables local code execution across nine distinct Office SKUs ranging from Excel 2016 through Microsoft 365 Apps for Enterprise. Exploitation requires a victim to open a specially crafted Excel file, making phishing and malicious-document delivery the primary attack vectors. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim open a specially crafted Microsoft Excel file using a vulnerable Office installation - user interaction (UI:R) is a hard prerequisite. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 rating is well-calibrated for this class of vulnerability. … 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 Microsoft-released patches for all affected Office product lines via Microsoft Update, the Office Deployment Tool, or Microsoft Intune. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Excel deployments across your organization (including Excel 2016, 2019, and Microsoft 365 subscription tiers) and communicate patch availability to IT teams and end-users. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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