CVE-2025-66389

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-22. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.5
EG Score
7.5(high)
EPSS
53.8%
KEV
Not listed

Published

June 22, 2026

Last Modified

June 30, 2026

Advisory Details (3)

Auto-updated Jun 22, 2026
No patch confirmed yet.
generic

vscode/src/vs/workbench/contrib/chat/electron-browser/tools/fetchPageTool.ts at 03baef1008086ed4960042fa463e570072173bb5 · microsoft/vscode · GitHub

https://github.com/microsoft/vscode/blob/03baef1008086ed4960042fa463e570072173bb5/src/vs/workbench/contrib/chat/electron-browser/tools/fetchPageTool.ts#L152
generic

GitHub - microsoft/vscode-copilot-chat: Copilot Chat extension for VS Code · GitHub

https://github.com/microsoft/vscode-copilot-chat/
generic

Vibe Pwning with GitHub Copilot | blindCyber

https://blindcyber.com/2025/10/28/copilot-fun/

Vendor Advisories for CVE-2025-66389(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 37× in last 7d / 70× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 00:55 UTCEG score recompute
  2. 2026-07-07 00:55 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 12:15 UTCEG score recompute
  6. 2026-07-06 12:15 UTCGHSA enrichment
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 23:18 UTCEG score recompute
  10. 2026-07-05 23:18 UTCGHSA enrichment
  11. 2026-07-05 10:37 UTCEG score recompute
  12. 2026-07-05 10:37 UTCGHSA enrichment
  13. 2026-07-05 02:30 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-04 21:54 UTCEG score recompute
  16. 2026-07-04 21:54 UTCGHSA enrichment
  17. 2026-07-04 09:14 UTCEG score recompute
  18. 2026-07-04 09:14 UTCGHSA enrichment
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 06:30 UTCEPSS rescore
  21. 2026-07-03 20:34 UTCEG score recompute
  22. 2026-07-03 20:34 UTCGHSA enrichment
  23. 2026-07-03 07:53 UTCEG score recompute
  24. 2026-07-03 07:53 UTCGHSA enrichment
  25. 2026-07-02 19:12 UTCEG score recompute
Show 45 more
  1. 2026-07-02 19:12 UTCGHSA enrichment
  2. 2026-07-02 06:33 UTCEG score recompute
  3. 2026-07-02 06:33 UTCGHSA enrichment
  4. 2026-07-01 17:51 UTCEG score recompute
  5. 2026-07-01 17:51 UTCGHSA enrichment
  6. 2026-07-01 15:06 UTCEPSS rescore
  7. 2026-07-01 15:06 UTCEPSS rescore
  8. 2026-07-01 05:10 UTCEG score recompute
  9. 2026-07-01 05:10 UTCGHSA enrichment
  10. 2026-06-30 23:22 UTCEPSS rescore
  11. 2026-06-30 16:30 UTCEG score recompute
  12. 2026-06-30 16:30 UTCGHSA enrichment
  13. 2026-06-30 03:50 UTCEG score recompute
  14. 2026-06-30 03:50 UTCGHSA enrichment
  15. 2026-06-29 15:09 UTCEG score recompute
  16. 2026-06-29 15:08 UTCGHSA enrichment
  17. 2026-06-29 14:06 UTCEPSS rescore
  18. 2026-06-29 14:06 UTCEPSS rescore
  19. 2026-06-29 02:28 UTCEG score recompute
  20. 2026-06-29 02:28 UTCGHSA enrichment
  21. 2026-06-28 14:07 UTCEPSS rescore
  22. 2026-06-28 14:07 UTCEPSS rescore
  23. 2026-06-28 13:48 UTCEG score recompute
  24. 2026-06-28 13:48 UTCGHSA enrichment
  25. 2026-06-28 04:56 UTCEPSS rescore
  26. 2026-06-28 04:55 UTCEPSS rescore
  27. 2026-06-28 01:09 UTCEG score recompute
  28. 2026-06-28 01:09 UTCGHSA enrichment
  29. 2026-06-27 12:29 UTCEG score recompute
  30. 2026-06-27 12:29 UTCGHSA enrichment
  31. 2026-06-27 03:08 UTCEPSS rescore
  32. 2026-06-26 23:48 UTCEG score recompute
  33. 2026-06-26 23:48 UTCGHSA enrichment
  34. 2026-06-26 11:09 UTCEG score recompute
  35. 2026-06-26 11:08 UTCGHSA enrichment
  36. 2026-06-25 19:15 UTCEG score recompute▲ 7.50
  37. 2026-06-25 19:15 UTCGHSA enrichment
  38. 2026-06-25 13:49 UTCEPSS rescore
  39. 2026-06-24 14:04 UTCEPSS rescore
  40. 2026-06-24 14:04 UTCEPSS rescore
  41. 2026-06-23 21:32 UTCEPSS rescore
  42. 2026-06-23 21:32 UTCEPSS rescore
  43. 2026-06-22 19:39 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  44. 2026-06-22 15:37 UTCEG score recompute
  45. 2026-06-22 15:37 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2025-66389?
CVE-2025-66389 is a high vulnerability published on June 22, 2026. 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.
When was CVE-2025-66389 disclosed?
CVE-2025-66389 was first published in the National Vulnerability Database on June 22, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-66389 actively exploited?
CVE-2025-66389 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 53.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-66389?
CVE-2025-66389 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2025-66389?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-66389, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2025-66389

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