Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

Date Jul 2, 2026

Type Patch Tuesday

Signal Critical vendor advisory

Vendor / Product Microsoft · Microsoft Edge (Chromium-based)

CVE CVE-2026-58289

Critical vendor advisory CVE-2026-58289

Summary

Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network. Published in July 2026 Early Security Updates. MSRC exploitability: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Unlikely.

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-2026-58289. Confirm whether Microsoft Edge (Chromium-based) is deployed, then apply the current security update or documented mitigation. CVSS score: 9.0.

Sources

MSRC 2026-Jul Security Update Guide NVD — CVE-2026-58289 Source reference

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

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