CVE-2025-66389CWE-552

CVE-2025-66389

High · published June 22, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
67.3
In the wild
Unconfirmed
What it is

GitHub Copilot 1.372.0 allows filesystem access outside of a workspace folder (without user approval) via a file-handler URI parameter to fetch_webpage. Therefore, exfiltration could occur if there is indirect prompt injection.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.01176 · 67.3th percentile
Weakness
CWE-552 · Files or Directories Accessible to External Parties
Published
2026-06-22T18:16Z
Affected products (1)
ProductVersionsFixed in
microsoft/github_copilotall versions—
References (3)
https://blindcyber.com/2025/10/28/copilot-fun/ · [email protected]https://github.com/microsoft/vscode-copilot-chat/ · [email protected]https://github.com/microsoft/vscode/blob/03baef1008086ed4960042fa463e570072173bb5/src/vs/workbench/contrib/chat/electron-browser/tools/fetchPageTool.ts#L152 · [email protected]
EPSS history
Timeline
  • 22 JUN 00:00Z
    GitHub Copilot 1.372.0 allows filesystem access outside of a workspace folder (without user approval) via a file-handler URI parameter to fetch_webpage
    cvelistv5