EUVD-2026-73881
GHSA-ffx4-j7rp-63h8
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-based local exploit requiring user to open a document; no attacker privileges needed; full code execution yields C:H/I:H/A:H with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Double free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Double-free memory corruption (CWE-415) in Microsoft Excel enables local arbitrary code execution across a wide range of Office product lines including Excel 2016, Office 2019, LTSC 2021/2024, and Microsoft 365 Apps for Enterprise. An attacker who delivers a specially crafted Excel workbook and convinces a target user to open it can achieve arbitrary code execution in the user's security context, with high confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target user must actively open a specially crafted Excel workbook file - exploitation requires active user interaction (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) reflects low exploitation complexity once the victim opens the crafted file, with no system-level privileges required of the attacker. … 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 Microsoft-released patches as follows: Excel 2016 and Office 2016 users should update to build 16.0.5569.1003 or later; Office 2019 users to build 16.0.10417.20204 or later; Office LTSC 2021 to build 16.0.14334.20896 or later; Office LTSC 2024 to build 16.0.17932.20960 or later; Microsoft 365 Apps for Enterprise to build 16.0.20326.20136 or later via the standard Microsoft Update channel or Office Deployment Tool. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Excel installations across your environment-including Excel 2016, Office 2019, LTSC 2021, LTSC 2024, and Microsoft 365 Apps for Enterprise-and communicate patch requirements to applicable teams and end users. …
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Same weakness CWE-415 – Double Free
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External POC / Exploit Code
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