RPC Runtime Remote Code Execution Vulnerability

Date Oct 13, 2026

Type Patch Tuesday

Signal High-risk advisory

Vendor / Product Microsoft · RPC Runtime

CVE CVE-2026-102203

High-risk advisory CVE-2026-102203

Summary

Access of resource using incompatible type ('type confusion') in RPC Runtime 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: 55%.

Operator check

Review the Microsoft Security Update Guide entry for CVE-2026-102203. Confirm whether RPC Runtime is deployed, then apply the current security update or documented mitigation. CVSS score: 8.8. EPSS probability: 0.8%; percentile: 55%.

Sources

MSRC 2026-Oct Security Update Guide NVD — CVE-2026-102203 Source reference

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