EUVD-2026-56760
GHSA-3w9w-7h4m-fvmr
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local vector with user interaction matches document-delivery exploit pattern; full CIA impact from unrestricted code execution in user context.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 when a user opens a specially crafted Excel file. The vulnerability triggers during file parsing, allowing an attacker who can deliver a malicious document to execute arbitrary code with the privileges of the logged-in user. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | User interaction is explicitly required: the victim must open a maliciously crafted Excel file for the overflow to trigger. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 7.8 reflects high confidentiality, integrity, and availability impact upon successful exploitation, constrained by a local attack vector and mandatory user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker sends a phishing email containing a crafted Excel workbook (.xlsx or .xls) to a target user. The user opens the attachment in Microsoft Excel, triggering the heap-based buffer overflow during file parsing, which overwrites heap metadata or function pointers to redirect execution flow. … |
| Remediation | Apply the Microsoft security update addressing CVE-2026-68812 via Windows Update or the Microsoft Update Catalog; the exact patched build version was not included in the provided data and must be confirmed against the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68812. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, issue a security alert to end users advising against opening Excel files from untrusted or unexpected sources, and identify high-value targets (finance, executive staff, partners with sensitive data access) who face elevated risk. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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