CVE-2025-66389 PUBLISHED

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.

• https://github.com/microsoft/vscode-copilot-chat/
• https://github.com/microsoft/vscode/blob/03baef1008086ed4960042fa463e570072173bb5/src/vs/workbench/contrib/chat/electron-browser/tools/fetchPageTool.ts#L152
• https://blindcyber.com/2025/10/28/copilot-fun/

• n/a text