EUVD-2026-56463
GHSA-656m-qv56-43cq
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-open trigger requires local access (AV:L), no attacker privileges needed (PR:N), user must open file (UI:R); full process compromise yields C/I/A:H.
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 when a victim opens a specially crafted file. The CVSS vector (AV:L/AC:L/PR:N/UI:R) confirms the attack is file-based: no attacker privileges are required, but the target user must open a malicious document, making this a high-impact phishing-delivery vector. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local user with a standard (non-privileged) account to open a specially crafted Excel file - no attacker-side authentication or network access to the target is required (PR:N, AV:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.8 High is well-calibrated for this class of vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Excel workbook (.xlsx, .xls, or similar format) embedding data structured to trigger the type confusion condition in Excel's parsing or object model layer. The file is delivered to the target via a phishing email or a compromised file share. … |
| Remediation | Apply the Microsoft security update published via the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68811. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, disable macros by default across all Excel installations via Group Policy or equivalent controls, alert all users to avoid opening Excel files from untrusted sources, and restrict email attachments to block spreadsheet file formats (.xlsx, .xls, .xlsm, .xlt). …
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External POC / Exploit Code
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