EUVD-2026-56466
GHSA-4x7r-w35q-cr5x
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-delivered exploit requires no privileges (PR:N) but mandates user interaction to open the document (UI:R); full code execution yields C:H/I:H/A:H within the unchanged user scope.
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 local code execution when a user opens a crafted file. The vulnerability (CWE-121) is triggered through user interaction with malicious content, requiring no privileges on the target system beyond access to run Excel. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target user to open a specially crafted Excel file - confirmed by UI:R in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) scores 7.8, reflecting high impact across all three pillars but constrained by local attack vector and required 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 spreadsheet to a targeted user. When the user opens the attachment in Microsoft Excel, the malformed file triggers a stack-based buffer overflow during parsing, overwriting the return address and redirecting execution to attacker-controlled shellcode or a ROP chain. … |
| Remediation | The primary remediation is to apply the vendor-released security update for Microsoft Office Excel via the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68816. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, disable Excel macro execution organization-wide using Group Policy or endpoint management solutions, and inventory systems running vulnerable Excel versions. …
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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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