# CVE-2026-58616: Microsoft Edge Copilot Chat race condition information disclosure

Source: https://junglewise.ai/threats/cve-2026-58616-microsoft-edge-copilot-chat-race-condition-information-disclosure  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-28. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-58616 · Severity: medium · CVSS 4.4 · Published 2026-08-28

Copilot Chat in Microsoft Edge contains a race condition vulnerability that allows an authorized attacker to access and disclose sensitive information over the network. This could expose confidential data handled by the chat system, potentially compromising user privacy or corporate information shared within the application.

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-2026-58616 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-58616 being exploited in the wild.

**How severe is CVE-2026-58616?** Medium severity, with a CVSS score of 4.4, published 28 August 2026.

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

**Is there a fix for CVE-2026-58616?** 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-2026-58616 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-58616?** 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 is a race condition (CWE-362) in the shared resource synchronization mechanism of Copilot Chat within Microsoft Edge. An authorized attacker can exploit improper synchronization of concurrent execution to access information that should be protected. The attack requires prior authentication and network access to the affected component. Successful exploitation allows information disclosure without requiring additional user interaction. Microsoft has published security updates to address this vulnerability.

## Affected products

- Microsoft Edge unknown

## Timeline

- 2026-08-28: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58616](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58616)

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