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

Source: https://junglewise.ai/threats/cve-2026-58294-microsoft-edge-use-after-free-remote-code-execution  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-03. Updated: 2026-07-03  
License: CC BY 4.0 with a link back

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)](https://junglewise.ai/threats/technologies/edge). Vendors: [Microsoft](https://junglewise.ai/threats/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

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58294](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58294)

## Related threats

- [Microsoft Edge authentication bypass in Chromium engine](https://junglewise.ai/threats/cve-2026-57980-microsoft-edge-authentication-bypass-in-chromium-engine)
- [Microsoft Edge type confusion security bypass](https://junglewise.ai/threats/cve-2026-58295-microsoft-edge-type-confusion-security-bypass)
- [Microsoft Edge type confusion remote code execution](https://junglewise.ai/threats/cve-2026-58289-microsoft-edge-type-confusion-remote-code-execution)
- [Microsoft Edge improper authorization remote code execution](https://junglewise.ai/threats/cve-2026-58284-microsoft-edge-improper-authorization-remote-code-execution)
- [Microsoft Edge type confusion in Chromium engine](https://junglewise.ai/threats/cve-2026-58283-microsoft-edge-type-confusion-in-chromium-engine)