# CVE-2026-78439

## Summary

- **CVE ID:** CVE-2026-78439
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
- **CWE:** CWE-121
- **Published:** Sep 8, 2026
- **Last Modified:** Sep 10, 2026

## Description

Stack-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.

## Affected Products

- Microsoft — Microsoft Office 365 for Mac (-)
- Microsoft — Microsoft Office for Android (16.0.1)
- Microsoft — Microsoft Office LTSC for Mac 2021 (-)
- Microsoft — Microsoft Office LTSC for Mac 2024 (-)

## References

- [CNA](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78439)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.62%
- **EPSS Percentile:** 47.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._