EUVD-2026-56460
GHSA-4pc4-7j3h-jqh9
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Local vector because exploitation requires opening a crafted file; PR:N as no target-system privileges are needed; C:H reflects meaningful memory disclosure; no integrity or availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Lifecycle Timeline
3DescriptionCVE.org
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
AnalysisAI
Out-of-bounds read in Microsoft Excel exposes process memory to local information disclosure across a wide range of Office versions, from Excel 2016 through Microsoft 365 Apps for Enterprise and multiple LTSC releases on both Windows and macOS. The CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N) confirms exploitation requires the victim to open a specially crafted spreadsheet file, making phishing-delivered documents the realistic delivery mechanism. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to open a specially crafted Excel spreadsheet file on a system running a vulnerable version of Microsoft Excel - this is the user interaction constraint captured as UI:R in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 5.5 (Medium) is well-calibrated for this vulnerability: the local attack vector (AV:L) eliminates any direct network exploitation path, and the required user interaction (UI:R) means a victim must actively open a malicious document. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Excel spreadsheet with a specially constructed record structure that triggers an out-of-bounds read in Excel's parser when the file is opened. The file is delivered to a target via a spear-phishing email attachment or a compromised file-sharing link, and the victim opens it with a vulnerable version of Excel. … |
| Remediation | Apply the vendor-released security update via Microsoft Update or the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68808. … Detailed patch versions, workarounds, and compensating controls in full report. |
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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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