Microsoft 365 Copilot — CVE-2026-58617 (Critical)

Date Jul 14, 2026

Type Vendor advisory

Signal Critical vendor advisory

Vendor / Product Microsoft · 365 Copilot

CVE CVE-2026-58617

Critical vendor advisory CVE-2026-58617

Summary

Improper access control in Microsoft 365 Copilot for iOS allows an unauthorized attacker to elevate privileges over a network.

Why it matters

This CVE carries a CRITICAL severity rating (CVSS 8.1) in Microsoft 365 Copilot. Patch or mitigate promptly. EPSS percentile: 48%.

Operator check

Review CVE-2026-58617 in your asset inventory. Apply patches per vendor guidance and verify 365 Copilot is not exposed. CVSS score: 8.1. EPSS probability: 0.7%; percentile: 48%.

Sources

NVD — CVE-2026-58617 Source reference

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

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