Skype for Business Remote Code Execution Vulnerability

Date Sep 8, 2026

Type Patch Tuesday

Signal Critical vendor advisory

Vendor / Product Microsoft · Skype for Business

CVE CVE-2026-66302

Critical vendor advisory CVE-2026-66302

Summary

External control of file name or path in Skype for Business allows an unauthorized attacker to execute code over a network. Published in September 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.

Operator check

Review the Microsoft Security Update Guide entry for CVE-2026-66302. Confirm whether Skype for Business is deployed, then apply the current security update or documented mitigation. CVSS score: 9.8.

Sources

MSRC 2026-Sep Security Update Guide NVD — CVE-2026-66302 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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