EUVD-2026-73857
GHSA-qxx7-ww2p-mmxw
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-based local attack requiring victim to open the document; no system privileges needed; full code execution impact on vulnerable user session.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Use-after-free code execution in Microsoft Excel allows a local unauthenticated attacker to execute arbitrary code at the privilege level of the victim user by enticing them to open a specially crafted workbook file. Affected products span the full current Office portfolio: Excel 2016, Office 2016/2019, Office LTSC 2021/2024 (Windows and Mac), and Microsoft 365 Apps for Enterprise. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must open a specially crafted Excel workbook file using a vulnerable version of Microsoft Excel on Windows or macOS. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) correctly reflects the file-based delivery model: an attacker need not hold any system account privileges, but the victim must actively open a malicious Excel document, capping the attack complexity at AC:L once delivery is achieved. … 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 Microsoft's Patch Tuesday updates that address CVE-2026-81954. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: issue user alert to avoid opening Excel attachments from untrusted sources; disable Office document auto-preview and auto-open functionality in email clients where operationally feasible. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
View allShare
External POC / Exploit Code
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