EUVD-2026-73871
GHSA-6f65-7xxh-p547
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-parsing RCE requires local file open (AV:L), no special configuration (AC:L), no attacker privilege (PR:N), victim must open file (UI:R), full CIA impact on user context.
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 in Microsoft Office Excel allows a local attacker to execute arbitrary code with the privileges of the victim user by convincing them to open a specially crafted Excel file. The vulnerability spans a wide range of currently supported Office releases - Excel 2016 through Microsoft 365 Apps for Enterprise, plus Office for Mac editions - making the attack surface broad. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must open a malicious Excel workbook file in an affected version of Microsoft Excel. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score reflects AV:L/AC:L/PR:N/UI:R - local delivery with low complexity, no required privileges, and mandatory user interaction (the victim must open the file). … 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 security updates through Windows Update, Microsoft Update, or the Microsoft Update Catalog as directed by the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81960. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all deployed Office versions (Excel 2016, 2019, 2021, Microsoft 365 Apps for Enterprise, and Office for Mac) and establish a priority-based patch schedule targeting high-risk user groups (finance, legal, external-facing functions). …
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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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