Unrated severityNVD Advisory· Published Jun 22, 2026· Updated Jun 22, 2026

CVE-2025-66389

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Microsoft/Github Copilot Chatllm-fuzzy
Range: = 1.372.0

Patches

Vulnerability mechanics

No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.

References

blindcyber.com/2025/10/28/copilot-fun/mitre
github.com/microsoft/vscode/blob/03baef1008086ed4960042fa463e570072173bb5/src/vs/workbench/contrib/chat/electron-browser/tools/fetchPageTool.tsmitre

News mentions

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