EUVD-2026-73867
GHSA-3jw3-7q3m-vwmm
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
File-open trigger is AV:L/UI:R; no attacker privileges needed (PR:N); read-only memory leak yields C:H with no write or crash 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 read in Microsoft Excel discloses sensitive memory contents when a victim opens a specially crafted Excel file. The vulnerability spans a wide range of affected versions including Excel 2016, Office 2019, LTSC 2021/2024, Office 365 for Mac, and Microsoft 365 Apps for Enterprise, making the patch surface broad across enterprise environments. …
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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 file on an unpatched installation of Microsoft Excel or Office (AV:L/UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 5.5 (Medium) reflects the realistic risk profile accurately: AV:L requires the victim to open a crafted file locally, and UI:R confirms user interaction is mandatory, substantially limiting opportunistic exploitation. … 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 | Apply the vendor-released patches via Microsoft Update or the Microsoft Update Catalog, targeting the specific fixed builds: Excel/Office 2016 to 16.0.5569.1003 or later, Office 2019 to 16.0.10417.20204 or later, Office LTSC 2021 to 16.0.14334.20896 or later, Office LTSC 2024 to 16.0.17932.20960 or later, and Microsoft 365 Apps for Enterprise to 16.0.20131.20246 or later. … 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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