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

Source: https://junglewise.ai/threats/cve-2026-58284-microsoft-edge-improper-authorization-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-2026-58284 · 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)](https://junglewise.ai/threats/technologies/edge). Vendors: [Microsoft](https://junglewise.ai/threats/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

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58284](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58284)

## 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 use after free remote code execution](https://junglewise.ai/threats/cve-2026-58294-microsoft-edge-use-after-free-remote-code-execution)
- [Microsoft Edge type confusion remote code execution](https://junglewise.ai/threats/cve-2026-58289-microsoft-edge-type-confusion-remote-code-execution)
- [Microsoft Edge type confusion in Chromium engine](https://junglewise.ai/threats/cve-2026-58283-microsoft-edge-type-confusion-in-chromium-engine)