Vulnerability · Published Aug 28, 2026 · Assigned by microsoft
CVE-2026-58616Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability
Medium 4.4
In plain English
A medium-severity race condition in Microsoft Edge (Chromium-based) from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).
Severity (CVSS 3.1)4.4Medium
Exploit odds (30 days)0.3%top 77.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft Edge (Chromium-based) | 1.0.0.0 – before 152.0.4191.53 |
| Microsoft | Microsoft Edge for Android | 1.0.0.0 – before 152.0.4191.52 |
| Microsoft | Microsoft Edge for iOS | 1.0.0.0 – before 152.0.4191.52 |
| Microsoft | Microsoft Edge for Linux | 1.0.0 – before 152.0.4191.52 |
| Microsoft | Microsoft Edge for MAC | 1.0.0.0 – before 152.0.4191.52 |
| Microsoft | Microsoft Edge for Windows | 1.0.0.0 – before 152.0.4191.52 |
Weakness: CWE-362 · Vector: 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
References
- Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability vendor-advisory, patch