CVE-2026-58616

Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability

State: Published
Severity: 4.4 Medium
Published: Aug 28, 2026
Updated: Oct 30, 2026
Reserved: Jul 1, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	4.4 Medium	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	microsoft

Weaknesses

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Affected Products

Product	Versions
Microsoft Edge (Chromium-based)Microsoft	1.0.0.0 to before 152.0.4191.53Affected
Microsoft Edge for AndroidMicrosoft	1.0.0.0 to before 152.0.4191.52Affected
Microsoft Edge for iOSMicrosoft	1.0.0.0 to before 152.0.4191.52Affected
Microsoft Edge for LinuxMicrosoft	1.0.0 to before 152.0.4191.52Affected
Microsoft Edge for MACMicrosoft	1.0.0.0 to before 152.0.4191.52Affected
Microsoft Edge for WindowsMicrosoft	1.0.0.0 to before 152.0.4191.52Affected

References

Copilot Chat (Microsoft Edge) Information Disclosure Vulnerabilityvendor-advisorypatch

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