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
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. No public exploit code or CISA KEV listing has been identified at time of analysis, but the low attack complexity (AC:L) indicates reliable exploitability once a working exploit is developed.
Technical ContextAI
CWE-125 (Out-of-Bounds Read) describes a memory safety defect in which a parsing routine reads beyond the allocated buffer boundary. In Microsoft Excel's file-parsing engine, a maliciously crafted spreadsheet triggers this condition, exposing memory contents that - consistent with the 'Information Disclosure' and 'Buffer Overflow' tags - can be leveraged to defeat memory protections and achieve a code execution primitive. The CVSS vector AV:L/UI:R confirms the vulnerability manifests during local file processing rather than via a network-accessible service, meaning the Excel document parser is the attack surface. No specific CPE strings enumerating affected Office build numbers are present in the provided data; the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68814 is the authoritative source for affected version enumeration.
RemediationAI
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. While awaiting patch deployment, enforce Office Protected View for files received from email and internet sources (enabled by default in many Office configurations, but verify Group Policy enforcement), which opens files in a restricted read-only sandbox that limits parser attack surface. Additionally, configure mail gateway policies to quarantine or warn on Office file attachments from external senders, and consider blocking macro-enabled formats for high-risk user groups. Note that Protected View does not fully prevent exploitation in all scenarios (e.g., files opened from local network shares), so patch application remains the definitive control. Patch unavailability has not been confirmed - patch status should be verified at the MSRC portal.
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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