# CVE-2026-85892: Microsoft Edge race condition in shared resource synchronization

Source: https://junglewise.ai/threats/cve-2026-85892-microsoft-edge-race-condition-in-shared-resource-synchronization  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-14. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-85892 · Severity: high · CVSS 7.8 · Published 2026-09-14

Microsoft Edge is a web browser used by millions of users to access the internet and business applications. A race condition flaw in the browser's internal resource handling could allow a local attacker with authorized access to bypass security protections and gain elevated system privileges, potentially compromising the entire device.

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-2026-85892 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-85892 being exploited in the wild.

**How severe is CVE-2026-85892?** High severity, with a CVSS score of 7.8, published 14 September 2026.

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

**Is there a fix for CVE-2026-85892?** 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-2026-85892 attacked?** It is attacked with local access, in a web application.

**Am I affected by CVE-2026-85892?** 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 race condition vulnerability exists in Microsoft Edge (Chromium-based) due to improper synchronization when accessing shared resources. An authorized local attacker can exploit this timing-dependent flaw to trigger a concurrent access condition, leading to privilege escalation. The attack requires local system access and is triggered during normal browser operation. Patches are expected to be available through Microsoft's standard security update cycle.

## Affected products

- Microsoft Edge <UNKNOWN>

## Timeline

- 2026-09-14: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85892](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85892)

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