EUVD-2026-56454
GHSA-w2v7-4mj3-h376
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AV:L and UI:R reflect file-based delivery requiring victim to open locally; PR:N because attacker needs no system account; full C/I/A from arbitrary 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
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 on the victim's local machine when a specially crafted Excel file is opened. The vulnerability carries a CVSS base score of 7.8 with high confidentiality, integrity, and availability impact, affecting the victim's user-level security context. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to actively open a specially crafted Excel file, confirmed by the UI:R metric in the CVSS vector - without this user interaction, the vulnerability cannot be triggered remotely. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 7.8 reflects a high-severity outcome - full code execution in the victim's user context - but the local attack vector (AV:L) and required user interaction (UI:R) are meaningful constraints. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Excel spreadsheet with specially structured data designed to overflow a stack buffer in Excel's document parser. The file is delivered to a target via a phishing email or a link to a compromised file-sharing service. … |
| Remediation | Apply the patch issued by Microsoft via the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68795. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, implement user awareness messaging to avoid opening Excel files from untrusted external sources and establish a process for validating file origin before opening. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Stack Overflow
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External POC / Exploit Code
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