EUVD-2026-56452
GHSA-45m5-pvjg-v496
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-parsing flaw requires local file open (AV:L, UI:R); no attacker privileges needed (PR:N); full process compromise achievable (C:H/I:H/A:H); scope unchanged (S:U).
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 workbook file. The CVSS vector (AV:L/AC:L/PR:N/UI:R) confirms file-based delivery requiring victim interaction, achieving full confidentiality, integrity, and availability impact on the compromised host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a victim user to open a specially crafted Excel file on a system running a vulnerable version of Microsoft Office Excel. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High score is supported by the C:H/I:H/A:H impact triad - full compromise of the host process is achievable. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Excel workbook containing a specially structured record designed to trigger the out-of-bounds read during parsing. The file is delivered via phishing email or a compromised file share, and the victim opens it with a vulnerable version of Microsoft Excel. … |
| Remediation | Apply the Microsoft security update addressing CVE-2026-68793 as published in the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68793. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Implement email gateway controls to block or quarantine .xlsx and .xls attachments from external senders, and alert employees to avoid opening untrusted workbook files. …
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Information Disclosure
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External POC / Exploit Code
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