CVE-2025-66389

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 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(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
66%
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 6× in last 7d / 60× 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.

Showing the most recent 100 of 224 total refreshes for this CVE.

  1. 2026-09-11 14:52 UTCEPSS rescore
  2. 2026-09-11 09:36 UTCEPSS rescore
  3. 2026-09-10 09:34 UTCEPSS rescore
  4. 2026-09-08 22:00 UTCEPSS rescore
  5. 2026-09-07 16:00 UTCEPSS rescore
  6. 2026-09-06 13:47 UTCEPSS rescore
  7. 2026-09-04 05:06 UTCEPSS rescore
  8. 2026-09-02 14:11 UTCEPSS rescore
  9. 2026-09-01 13:53 UTCEPSS rescore
  10. 2026-08-30 20:34 UTCEG score recompute
  11. 2026-08-30 20:34 UTCGHSA enrichment
  12. 2026-08-30 19:16 UTCEPSS rescore
  13. 2026-08-30 01:21 UTCEPSS rescore
  14. 2026-08-28 21:40 UTCEPSS rescore
  15. 2026-08-27 14:24 UTCEPSS rescore
  16. 2026-08-26 14:45 UTCEPSS rescore
  17. 2026-08-25 13:48 UTCEPSS rescore
  18. 2026-08-25 02:37 UTCEG score recompute
  19. 2026-08-25 02:37 UTCGHSA enrichment
  20. 2026-08-24 14:16 UTCEPSS rescore
  21. 2026-08-24 13:57 UTCEG score recompute
  22. 2026-08-24 13:57 UTCGHSA enrichment
  23. 2026-08-24 00:11 UTCGHSA enrichment
  24. 2026-08-23 11:31 UTCEG score recompute
  25. 2026-08-23 11:31 UTCGHSA enrichment
Show 75 more
  1. 2026-08-23 00:18 UTCEPSS rescore
  2. 2026-08-22 22:51 UTCEG score recompute
  3. 2026-08-22 22:51 UTCGHSA enrichment
  4. 2026-08-21 23:48 UTCEPSS rescore
  5. 2026-08-21 22:22 UTCGHSA enrichment
  6. 2026-08-21 09:26 UTCEG score recompute
  7. 2026-08-21 09:26 UTCGHSA enrichment
  8. 2026-08-20 22:55 UTCEPSS rescore
  9. 2026-08-20 20:32 UTCGHSA enrichment
  10. 2026-08-20 07:52 UTCEG score recompute
  11. 2026-08-20 07:52 UTCGHSA enrichment
  12. 2026-08-19 17:03 UTCEPSS rescore
  13. 2026-08-19 04:56 UTCEG score recompute
  14. 2026-08-19 04:55 UTCGHSA enrichment
  15. 2026-08-18 13:47 UTCEPSS rescore
  16. 2026-08-17 14:20 UTCEG score recompute
  17. 2026-08-17 14:20 UTCGHSA enrichment
  18. 2026-08-17 13:46 UTCEPSS rescore
  19. 2026-08-17 01:40 UTCEG score recompute
  20. 2026-08-17 01:40 UTCGHSA enrichment
  21. 2026-08-16 14:55 UTCEPSS rescore
  22. 2026-08-16 13:00 UTCEG score recompute
  23. 2026-08-16 13:00 UTCGHSA enrichment
  24. 2026-08-16 02:13 UTCEPSS rescore
  25. 2026-08-16 00:20 UTCGHSA enrichment
  26. 2026-08-15 11:40 UTCEG score recompute
  27. 2026-08-15 11:40 UTCGHSA enrichment
  28. 2026-08-15 01:30 UTCEPSS rescore
  29. 2026-08-15 01:29 UTCEPSS rescore
  30. 2026-08-14 23:00 UTCGHSA enrichment
  31. 2026-08-14 10:21 UTCEG score recompute
  32. 2026-08-14 10:21 UTCGHSA enrichment
  33. 2026-08-13 21:59 UTCEPSS rescore
  34. 2026-08-13 21:41 UTCGHSA enrichment
  35. 2026-08-13 08:46 UTCGHSA enrichment
  36. 2026-08-12 20:06 UTCEG score recompute
  37. 2026-08-12 20:06 UTCGHSA enrichment
  38. 2026-08-12 13:50 UTCEPSS rescore
  39. 2026-08-12 07:26 UTCGHSA enrichment
  40. 2026-08-11 18:45 UTCEG score recompute
  41. 2026-08-11 18:45 UTCGHSA enrichment
  42. 2026-08-11 13:42 UTCEPSS rescore
  43. 2026-08-11 06:06 UTCEG score recompute
  44. 2026-08-11 06:06 UTCGHSA enrichment
  45. 2026-08-10 23:59 UTCEPSS rescore
  46. 2026-08-10 17:26 UTCGHSA enrichment
  47. 2026-08-10 03:11 UTCGHSA enrichment
  48. 2026-08-09 14:32 UTCEG score recompute
  49. 2026-08-09 14:32 UTCGHSA enrichment
  50. 2026-08-09 13:46 UTCEPSS rescore
  51. 2026-08-09 13:46 UTCEPSS rescore
  52. 2026-08-09 01:52 UTCEG score recompute
  53. 2026-08-09 01:52 UTCGHSA enrichment
  54. 2026-08-08 16:36 UTCEPSS rescore
  55. 2026-08-08 13:13 UTCGHSA enrichment
  56. 2026-08-08 00:33 UTCEG score recompute
  57. 2026-08-08 00:33 UTCGHSA enrichment
  58. 2026-08-07 16:26 UTCEPSS rescore
  59. 2026-08-07 11:53 UTCGHSA enrichment
  60. 2026-08-06 23:13 UTCEG score recompute
  61. 2026-08-06 23:13 UTCGHSA enrichment
  62. 2026-08-06 13:46 UTCEPSS rescore
  63. 2026-08-06 10:06 UTCGHSA enrichment
  64. 2026-08-05 21:26 UTCEG score recompute
  65. 2026-08-05 21:26 UTCGHSA enrichment
  66. 2026-08-05 19:17 UTCEPSS rescore
  67. 2026-08-05 19:17 UTCEPSS rescore
  68. 2026-08-05 08:46 UTCGHSA enrichment
  69. 2026-08-04 15:38 UTCEG score recompute
  70. 2026-08-04 15:38 UTCGHSA enrichment
  71. 2026-08-04 15:09 UTCEPSS rescore
  72. 2026-08-04 10:37 UTCEPSS rescore
  73. 2026-08-04 02:58 UTCGHSA enrichment
  74. 2026-08-03 14:19 UTCEG score recompute
  75. 2026-08-03 14:19 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 1% probability of exploitation in the next 30 days, which ranks it in the top 34.2% of all scored CVEs.
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

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