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Microsoft Security Response CenterCVE-2026-58616

Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability

MediumVendor CVSS 4.4 / 10 1 CVE Published Aug 28, 2026 at 7:00 AM UTC
Get alerts for Microsoft Edge (Chromium-based)

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.

Products covered

  • Microsoft Edge (Chromium-based)

  • Microsoft Edge for Android

  • Microsoft Edge for MAC

  • Microsoft Edge for iOS

  • Microsoft Edge for Linux

  • Microsoft Edge for Windows

Remediation

Release Notes

Vendor-listed fixes

  • 152.0.4191.52

CVEs in this advisory 1

CVE-2026-58616
Update history

What changed in later vendor updates

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

    • Added affected products: Microsoft Edge for Android, Microsoft Edge for iOS, Microsoft Edge for Linux, Microsoft Edge for MAC, Microsoft Edge for Windows.
    • Added fixed versions: 152.0.4191.52.
    • Removed fixed versions: 152.0.4191.53.

Updates

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.

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