CVE-2026-58284: Microsoft Edge improper authorization remote code execution

CVE-2026-58284 · Severity: high · CVSS 8.3 · Published 2026-07-03

Microsoft Edge, a widely used web browser, contains a security flaw that could allow an attacker to execute malicious code on a user's computer. To exploit this, an attacker would typically need to trick a user into visiting a specially crafted website or clicking a malicious link. If successful, the attacker could gain full control over the user's system, potentially leading to data theft or further network compromise.

Technologies: Microsoft Edge (Chromium-based). Vendors: Microsoft.

Quick answers

Is CVE-2026-58284 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-58284 being exploited in the wild.
How severe is CVE-2026-58284?
High severity, with a CVSS score of 8.3, published 3 July 2026.
Which products and versions are affected?
Microsoft Edge (Chromium-based) 1.0.0.0 to 150.0.4078.48.
Is there a fix for CVE-2026-58284?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-58284 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-58284?
Check whether you run Microsoft Edge (Chromium-based) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An improper authorization vulnerability (CWE-285) exists in Microsoft Edge (Chromium-based) versions prior to 150.0.4078.48. The flaw allows a remote, unauthenticated attacker to achieve arbitrary code execution via a network-based attack vector. Exploitation requires user interaction, such as visiting a malicious webpage, and is characterized by high complexity due to the specific conditions needed to bypass authorization checks. Successful exploitation results in a full compromise of confidentiality, integrity, and availability (CVSS 8.3). Microsoft has released updates to address this issue.

Affected products

  • Microsoft Edge (Chromium-based) 1.0.0.0 to 150.0.4078.48

Timeline

  • 2026-07-03: advisory: Initial disclosure by Microsoft and NVD publication.

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.