EUVD-2026-56757
GHSA-3gc6-9vg4-vj89
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-borne delivery; PR:N because no attacker credentials needed; full C/I/A:H for 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
Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Type confusion (CWE-843) in Microsoft Office Excel enables local code execution by an unauthenticated attacker when a victim opens a specially crafted Excel document. The CVSS:3.1 vector (AV:L/AC:L/PR:N/UI:R) confirms this is a file-borne attack requiring user interaction but no attacker privileges, with full High/High/High C/I/A impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must open a specially crafted Excel document in a vulnerable version of Microsoft Excel - this is the sole prerequisite. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High score is credible and consistent with a file-based code execution primitive: AV:L reflects that exploitation occurs when the victim opens a local file (the typical Office attack surface), AC:L indicates no race condition or special environment is needed, PR:N confirms the attacker needs no account on the victim system, and UI:R captures the required file-open action. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Excel file (.xlsx, .xls, or similar) containing a type-confused object that triggers the parser bug upon opening. The file is delivered to a target via spear-phishing email or a malicious download link, and when the victim opens it in a vulnerable Excel installation, the type confusion corrupts memory and redirects execution to attacker-controlled shellcode running under the victim's user account. … |
| Remediation | Apply the Microsoft security update addressing CVE-2026-68803, available through the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68803. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Immediately within 24 hours: communicate vulnerability details to all users, disable macro execution in Excel organization-wide, and instruct staff to avoid opening Excel files from untrusted sources or unexpected senders. …
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External POC / Exploit Code
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