EUVD-2026-73882
GHSA-7v4q-7627-v6mx
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-parsing trigger requires local file open (AV:L, UI:R); no attacker privileges needed (PR:N); full compromise of victim session on success (C:H/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Heap-based buffer overflow (CWE-122) in Microsoft Office Excel allows a local, unauthenticated attacker to execute arbitrary code with the privileges of the victim user by convincing them to open a specially crafted Excel file. The vulnerability affects a broad range of Office releases spanning Excel 2016 through Office LTSC 2024, on both Windows and macOS. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must actively open a specially crafted Excel workbook file on a system running a vulnerable version of Microsoft Excel or any Office suite that includes Excel. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) accurately reflects the threat model: exploitation is local, requiring the victim to actively open a malicious file, which limits automated mass exploitation but is entirely realistic through phishing or malicious email attachments. … 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 via Windows Update or Microsoft Update Catalog targeting the fixed build numbers per product line: 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; Microsoft 365 Apps for Enterprise to 16.0.20326.20136 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Excel installations (2016 through LTSC 2024) across Windows and macOS endpoints and issue guidance to defer opening Excel attachments from external senders until patches deploy. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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