---
id: CVE-2026-58616
title: Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability
summary: >-
  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.
severity: medium
cvss: 4.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-362
vendor: Microsoft
product: Microsoft Edge (Chromium-based)
affected:
  - edge_chromium-based -
  - edge_for_android >= 1.0.0.0 < 152.0.4191.52
  - edge_for_ios >= 1.0.0.0 < 152.0.4191.52
  - edge_for_linux >= 1.0.0 < 152.0.4191.52
  - edge_for_mac >= 1.0.0.0 < 152.0.4191.52
  - edge_for_windows >= 1.0.0.0 < 152.0.4191.52
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-28T20:15:16.258744Z'
published: '2026-08-28'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T13:45:56.454Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-58616'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58616'
    label: Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability
tags:
  - cve.org
epss: 0.00295
epssPercentile: 0.19636
ingestedAt: '2026-09-12T20:03:06.206Z'
---

## Overview

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.

## Affected

- `edge_chromium-based -`
- `edge_for_android >= 1.0.0.0 < 152.0.4191.52`
- `edge_for_ios >= 1.0.0.0 < 152.0.4191.52`
- `edge_for_linux >= 1.0.0 < 152.0.4191.52`
- `edge_for_mac >= 1.0.0.0 < 152.0.4191.52`
- `edge_for_windows >= 1.0.0.0 < 152.0.4191.52`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.