# CVE-2026-88090: Microsoft Edge type confusion vulnerability in resource access

Source: https://junglewise.ai/threats/cve-2026-88090-access-of-resource-using-incompatible-type-type-confusion-in  
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-2026-88090 · Severity: medium · CVSS 5.4 · Published 2026-10-29

Microsoft Edge, a web browser used by millions globally, contains a type confusion flaw that allows an attacker to bypass security boundaries and gain elevated privileges through a network. An attacker can exploit this to break out of the browser's sandbox and potentially access sensitive user data or execute code with system-level permissions.

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

## Quick answers

**Is CVE-2026-88090 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-88090 being exploited in the wild.

**How severe is CVE-2026-88090?** Medium severity, with a CVSS score of 5.4, published 29 October 2026.

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

**Is there a fix for CVE-2026-88090?** 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-2026-88090 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-88090?** Check whether you run Microsoft Edge 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 exists in Microsoft Edge's resource handling mechanism, where incompatible type assumptions lead to memory corruption or control-flow hijacking. The flaw is remotely exploitable over the network and requires no authentication or user interaction beyond visiting a malicious webpage, allowing privilege escalation within the browser context.

## Affected products

- Microsoft Edge <UNKNOWN>

## Timeline

- 2026-10-29: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88090](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88090)

## 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)