EUVD-2026-56761
GHSA-2v44-37v7-xj8c
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-based exploitation requires user to open crafted document (AV:L, UI:R); no system privileges needed (PR:N); successful exploitation yields full code execution (C:H/I:H/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
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Out-of-bounds read in Microsoft Office Excel enables local code execution when a user opens a specially crafted spreadsheet file. The vulnerability (CWE-125) carries a CVSS 7.8 score with high impact across confidentiality, integrity, and availability, and is reported directly by Microsoft via the MSRC update guide. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim open a specially crafted Excel spreadsheet file using a vulnerable version of Microsoft Office Excel - confirmed by CVSS UI:R (User Interaction Required) and AV:L (Local attack vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score and vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H reflect a serious but delivery-constrained vulnerability: exploitation requires a user to open a malicious file, and all code execution occurs within the local user context. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Excel spreadsheet embedding a payload that triggers the out-of-bounds read in Excel's file parser and delivers it via a targeted phishing email. When the victim opens the attachment in a vulnerable version of Microsoft Office Excel, the parser reads beyond buffer bounds, and through memory layout exploitation, the attacker achieves arbitrary code execution in the victim's user context. … |
| Remediation | Apply the Microsoft security update published via the MSRC Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68814 as the primary fix; the exact patched build number is not confirmed in the available data and must be verified from the advisory directly. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Microsoft Office Excel installations across the organization via asset management or SIEM; brief executive stakeholders on CVE-2026-68814 (CVSS 7.8, no patch available) and escalating exploitation risk; establish an emergency change window for protective controls. …
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Same weakness CWE-125 – Out-of-bounds Read
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External POC / Exploit Code
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