# CVE-2026-58283: Microsoft Edge type confusion in Chromium engine

Source: https://junglewise.ai/threats/cve-2026-58283-microsoft-edge-type-confusion-in-chromium-engine  
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-2026-58283 · Severity: high · CVSS 8.1 · Published 2026-07-03

Microsoft Edge, a widely used web browser, is affected by a security flaw that could allow an attacker to impersonate legitimate websites or services. By exploiting this vulnerability, a remote attacker could deceive users into providing sensitive information or interacting with malicious content. This poses a risk to data integrity and could lead to unauthorized access to user accounts or corporate resources.

Technologies: [Microsoft Edge (Chromium-based)](https://junglewise.ai/threats/technologies/edge). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-58283 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-58283 being exploited in the wild.

**How severe is CVE-2026-58283?** High severity, with a CVSS score of 8.1, 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-2026-58283?** 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-2026-58283 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-58283?** 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 type confusion vulnerability (CWE-843) exists in Microsoft Edge (Chromium-based) when processing resources using incompatible types. The flaw allows an unauthenticated attacker to conduct spoofing attacks over the network. While the attack complexity is rated as high, successful exploitation could lead to a scope change, impacting the integrity of the browser's security boundaries. The vulnerability is addressed in versions starting from 150.0.4078.48.

## Affected products

- Microsoft Edge (Chromium-based) 1.0.0.0 to 150.0.4078.48

## Timeline

- 2026-07-03: disclosed
- 2026-07-03: advisory

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58283](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58283)

## 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 improper authorization remote code execution](https://junglewise.ai/threats/cve-2026-58284-microsoft-edge-improper-authorization-remote-code-execution)