# CVE-2026-85893: Microsoft Edge use-after-free in Chromium

Source: https://junglewise.ai/threats/cve-2026-85893-microsoft-edge-use-after-free-in-chromium  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-15. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-85893 · Severity: high · CVSS 8.8 · Published 2026-09-15

Microsoft Edge is a web browser used by millions to access websites and cloud services. A use-after-free vulnerability in Edge's Chromium engine could allow an attacker to elevate privileges and take control of the browser or the underlying system when a user visits a malicious website or opens a specially crafted file.

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-2026-85893 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-85893 being exploited in the wild.

**How severe is CVE-2026-85893?** High severity, with a CVSS score of 8.8, published 15 September 2026.

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

**Is there a fix for CVE-2026-85893?** 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-2026-85893 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-85893?** 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

A use-after-free vulnerability exists in the Chromium rendering engine used by Microsoft Edge. The vulnerability occurs when the browser attempts to access memory that has already been freed, potentially leading to memory corruption. An attacker can exploit this flaw remotely by crafting a malicious web page or file; when a user interacts with it, the attacker gains the ability to execute arbitrary code and escalate privileges. The vulnerability is reachable over the network and does not require prior authentication.

## Affected products

- Microsoft Edge <UNKNOWN>

## Timeline

- 2026-09-15: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85893](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85893)

## 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)