EUVD-2026-73868
GHSA-qj2m-985c-fjvh
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Local file-open delivery (AV:L), no attacker privileges (PR:N), victim must open crafted document (UI:R), read-only memory exposure with no integrity or availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
AnalysisAI
Out-of-bounds memory read in Microsoft Excel exposes potentially sensitive in-process memory contents when a user opens a specially crafted workbook. Affects a wide range of Office versions including Microsoft 365 Apps for Enterprise, Office 2016 through LTSC 2024, and Office for Mac editions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must actively open a crafted Excel workbook on a Windows or macOS system running an unpatched Office version. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.5 medium score accurately reflects the limited real-world risk profile: the attack vector is local (AV:L), requiring the victim to open a crafted file, and the impact is confined entirely to confidentiality (C:H/I:N/A:N). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: apply the fixed builds listed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81400 - specifically build 16.0.20131.20246 or later for Microsoft 365 Apps for Enterprise, 16.0.5569.1003 or later for Office 2016 and Excel 2016, 16.0.10417.20204 or later for Office 2019, 16.0.14334.20896 or later for Office LTSC 2021, and 16.0.17932.20960 or later for Office LTSC 2024. … 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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