VulnerabilityAnalyzed

CVE-2025-66389

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.

HIGH 7.5EPSS 1.18%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (1.18%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

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.

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS: 1.18% probability · 66th percentile
CISA KEV: Not listed
Weakness: CWE-552
Affected: microsoft/github copilot
Source: cve@mitre.org

References

https://blindcyber.com/2025/10/28/copilot-fun/Exploit, Third Party Advisory
https://github.com/microsoft/vscode-copilot-chat/Product
https://github.com/microsoft/vscode/blob/03baef1008086ed4960042fa463e570072173bb5/src/vs/workbench/contrib/chat/electron-browser/tools/fetchPageTool.ts#L152Product

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.