EUVD-2026-73869
GHSA-pf79-2f72-q545
Severity by source
AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
File-parsing exploit requires local execution and heap-grooming conditions (AC:H); no privileges needed but user must open the file (UI:R).
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 enables local code execution when a victim opens a specially crafted Excel file. Affected products span the full Office portfolio - Excel 2016, Office 2019, 2021, 2024 LTSC editions, and Microsoft 365 Apps for Enterprise on both Windows and Mac. …
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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 file (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.0 reflects a local-vector (AV:L), high-complexity (AC:H), user-interaction-required (UI:R) attack path, which meaningfully reduces real-world exploitability versus network-delivered vulnerabilities. … 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 security update addressing CVE-2026-81389 via Windows Update, Microsoft Update Catalog, or the Microsoft 365 Admin Center. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running Excel 2016, Office 2019, 2021, 2024 LTSC editions, and Microsoft 365 Apps for Enterprise (Windows and Mac), and communicate a security alert advising users to avoid opening unexpected Excel files. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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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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