# CVE-2026-66326: Microsoft Edge missing authorization allows remote code execution

Source: https://junglewise.ai/threats/cve-2026-66326-microsoft-edge-missing-authorization-allows-remote-code-execution  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-04. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-66326 · Severity: medium · CVSS 6.5 · Published 2026-08-04

Microsoft Edge is a web browser used by millions to access the internet. A missing authorization flaw allows an attacker to execute code remotely through the network without proper authentication, potentially compromising user data and system integrity.

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

## Quick answers

**Is CVE-2026-66326 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-66326 being exploited in the wild.

**How severe is CVE-2026-66326?** Medium severity, with a CVSS score of 6.5, published 4 August 2026.

**Which products and versions are affected?** Microsoft Edge <UNKNOWN>.

**Is there a fix for CVE-2026-66326?** 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-2026-66326 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-66326?** Check whether you run Microsoft Edge or Microsoft Edge Chromium 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

The vulnerability stems from missing authorization checks in Microsoft Edge (Chromium-based). An attacker can exploit this flaw over the network to execute arbitrary code with the privileges of the affected user. No user interaction or pre-authentication is required to trigger the vulnerability. The attack vector is network-based, making it remotely exploitable. Microsoft has published a security update to remediate this issue.

## Affected products

- Microsoft Edge <UNKNOWN>

## Timeline

- 2026-08-04: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66326](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66326)

## Related threats

- [Microsoft Edge out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-122518-out-of-bounds-read-in-microsoft-edge-chromium-based-allows-an)
- [Microsoft Edge privilege escalation via incorrect authorization](https://junglewise.ai/threats/cve-2026-69446-incorrect-authorization-in-microsoft-edge-chromium-based-allows)
- [Microsoft Edge use-after-free privilege elevation](https://junglewise.ai/threats/cve-2026-96203-use-after-free-in-microsoft-edge-chromium-based-allows-an)
- [Microsoft Edge heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-96199-heap-based-buffer-overflow-in-microsoft-edge-chromium-based)
- [Microsoft Edge heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-96198-heap-based-buffer-overflow-in-microsoft-edge-chromium-based)