# CVE-2026-96203: Microsoft Edge use-after-free privilege elevation

Source: https://junglewise.ai/threats/cve-2026-96203-use-after-free-in-microsoft-edge-chromium-based-allows-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-29. Updated: 2026-10-29  
License: CC BY 4.0 with a link back

CVE-2026-96203 · Severity: high · CVSS 8.8 · Published 2026-10-29

Microsoft Edge is a web browser used by millions of users worldwide. A use-after-free vulnerability in Edge allows an attacker to execute arbitrary code and gain elevated privileges on an affected system through a network attack. This could lead to complete compromise of the user's computer, including theft of sensitive data and installation of malware.

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

## Quick answers

**Is CVE-2026-96203 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-96203 being exploited in the wild.

**How severe is CVE-2026-96203?** High severity, with a CVSS score of 8.8, published 29 October 2026.

**Which products and versions are affected?** Microsoft Edge.

**Is there a fix for CVE-2026-96203?** 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-2026-96203 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-96203?** Check whether you run Microsoft Edge. 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 vulnerability exists in Microsoft Edge (Chromium-based) that permits privilege escalation. The vulnerability can be exploited over the network by an unauthorized attacker, allowing arbitrary code execution with elevated privileges. A patch from Microsoft addresses this issue.

## Affected products

- Microsoft Edge

## Timeline

- 2026-10-29: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96203](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96203)

## 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 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)
- [Microsoft Edge incomplete input validation bypass](https://junglewise.ai/threats/cve-2026-96196-incomplete-list-of-disallowed-inputs-in-microsoft-edge-chromium)