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Fencer Vulns
medium 4.4

CVE-2026-58616 json

Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability

published 2026-08-28 2 mo ago modified 2026-10-30 9 d ago also EUVD-2026-67847

cvss
4.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

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.

Patch / fix

  • Microsoft Microsoft Edge (Chromium-based) 152.0.4191.53
  • Microsoft Microsoft Edge for Android 152.0.4191.52
  • Microsoft Microsoft Edge for iOS 152.0.4191.52
  • Microsoft Microsoft Edge for Linux 152.0.4191.52
  • Microsoft Microsoft Edge for MAC 152.0.4191.52
  • Microsoft Microsoft Edge for Windows 152.0.4191.52

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.4 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
CNA 3.1 4.4 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD 3.1 3.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N

Affected products

  • Microsoft Microsoft Edge (Chromium-based)
  • Microsoft Microsoft Edge for Android
  • Microsoft Microsoft Edge for iOS
  • Microsoft Microsoft Edge for Linux
  • Microsoft Microsoft Edge for MAC
  • Microsoft Microsoft Edge for Windows

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.