CVE-2026-58294: Microsoft Edge use after free remote code execution

CVE-2026-58294 · Severity: high · CVSS 7.5 · Published 2026-07-03

Microsoft Edge, the primary web browser for Windows systems, is affected by a security flaw that could allow an attacker to run 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, this could lead to a full compromise of the user's workstation, potentially exposing sensitive data or providing a foothold for further attacks within the corporate network.

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

Quick answers

Is CVE-2026-58294 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-58294 being exploited in the wild.
How severe is CVE-2026-58294?
High severity, with a CVSS score of 7.5, 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-2026-58294?
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-2026-58294 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-58294?
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

A use-after-free (UAF) vulnerability exists in Microsoft Edge (Chromium-based) due to improper memory management. The flaw is triggered when the browser attempts to access memory that has already been freed, which can be leveraged by a remote, unauthenticated attacker to achieve arbitrary code execution. The attack vector is network-based, though it requires high complexity and user interaction, such as convincing a victim to visit a malicious URL. Microsoft has addressed this in version 150.0.4078.48 and later.

Affected products

  • Microsoft Edge (Chromium-based) 1.0.0.0 to 150.0.4078.48

Timeline

  • 2026-07-03: advisory: Initial publication of the CVE record by Microsoft and NVD.

References

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