Low severity · published Aug 28, 2026
CVE-2026-58616
Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability
3.0
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
Microsoft Edge (Chromium-based) · Microsoft
All versions, or not specified · source: vendor
ME
Microsoft Edge for Android · Microsoft
1.0.0.0 before 152.0.4191.52 · source: vendor
ME
Microsoft Edge for Linux · Microsoft
1.0.0 before 152.0.4191.52 · source: vendor
ME
Microsoft Edge for MAC · Microsoft
1.0.0.0 before 152.0.4191.52 · source: vendor
ME
Microsoft Edge for Windows · Microsoft
1.0.0.0 before 152.0.4191.52 · source: vendor
ME
Microsoft Edge for iOS · Microsoft
1.0.0.0 before 152.0.4191.52 · source: vendor
EC
Edge Chromium · Microsoft
before 152.0.4191.53 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-58616
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-58616
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58616
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