What is CVE-2026-58289?

CVE-2026-58289 is a critical-severity vulnerability in Microsoft Edge (Chromium-based), classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 9.0/10. Published 2026-07-03.

How severe is CVE-2026-58289?

Critical severity. CVSS v3 base score is 9.0 out of 10.

Vulnerability in Microsoft Edge (Chromium-based)

CVE-2026-58289

Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Microsoft Edge (Chromium-based) — versions 1.0.0.0

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-58289?: CVE-2026-58289 is a critical-severity vulnerability in Microsoft Edge (Chromium-based), classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 9.0/10. Published 2026-07-03.
How severe is CVE-2026-58289?: Critical severity. CVSS v3 base score is 9.0 out of 10.