What is CVE-2026-58287?

CVE-2026-58287 is a high-severity vulnerability in Microsoft Edge (Chromium-based), classified under Use After Free. CVSS score: 8.3/10. Published 2026-07-03.

How severe is CVE-2026-58287?

High severity. CVSS v3 base score is 8.3 out of 10.

Use After Free in Microsoft Edge (Chromium-based)

CVE-2026-58287

Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

Vulnerability class: Use-After-Free

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Microsoft Edge (Chromium-based) — versions 1.0.0.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

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

Frequently asked questions

What is CVE-2026-58287?: CVE-2026-58287 is a high-severity vulnerability in Microsoft Edge (Chromium-based), classified under Use After Free. CVSS score: 8.3/10. Published 2026-07-03.
How severe is CVE-2026-58287?: High severity. CVSS v3 base score is 8.3 out of 10.