Microsoft Office Visio Remote Code Execution Vulnerability

Summary

Heap-based buffer overflow in Microsoft Office Visio allows an unauthorized attacker to execute code over a network. Published in October 2026 Security Updates. MSRC exploitability: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely.

Why it matters

Microsoft published this item through its Security Update Guide, making it part of Patch Tuesday triage for affected Windows, cloud, or application estates. EPSS percentile: 56%.

Operator check

Review the Microsoft Security Update Guide entry for CVE-2026-102856. Confirm whether Microsoft Office Visio is deployed, then apply the current security update or documented mitigation. CVSS score: 8.8. EPSS probability: 0.8%; percentile: 56%.

Sources