CVE-2026-58616

Received Received - Intake

Race Condition in Copilot Chat for Microsoft Edge

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: Microsoft Corporation

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Copilot Chat (Microsoft Edge) allows an authorized attacker to disclose information over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-28

Last Modified

2026-08-28

Generated

2026-08-29

AI Q&A

2026-08-29

EPSS Evaluated

N/A

NVD

CVE-2026-58616

EUVD

EUVD-2026-67847

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	copilot_chat	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-362	The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Attack-Flow Graph

Executive Summary

This is a race condition vulnerability in Copilot Chat within Microsoft Edge. It occurs when improper synchronization allows concurrent execution to access shared resources, enabling an authorized attacker to disclose information over a network.

Impact Analysis

An attacker could exploit this to access sensitive information that should be restricted. This may include chat logs, user data, or other confidential details shared through Copilot Chat.

Compliance Impact

This vulnerability could lead to unauthorized disclosure of personal or sensitive data, potentially violating GDPR, HIPAA, or other privacy regulations. Organizations using Copilot Chat may face compliance risks if data is exposed.

Mitigation Strategies

Update Microsoft Edge to the latest version to patch the race condition in Copilot Chat. Monitor network traffic for unusual information disclosure patterns and restrict unauthorized access to Copilot Chat features.

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