How severe is CVE-2025-66389?

CVE-2025-66389 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-66389 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66389?

CVE-2025-66389 affects Microsoft Github Copilot. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66389?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-66389 have an EU (EUVD) identifier?

Yes. CVE-2025-66389 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-210298.

When was CVE-2025-66389 published?

CVE-2025-66389 was published on 2026-06-22 and last updated on 2026-06-30.

CVE-2025-66389

CVE-2025-66389 is a high-severity vulnerability in Microsoft Github Copilot with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-552.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-210298
Weakness: CWE-552
Affected product: Microsoft Github Copilot
Published: 2026-06-22
Last modified: 2026-06-30

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.

Frequently asked questions

What is 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. Therefore, exfiltration could occur if there is indirect prompt injection.
How severe is CVE-2025-66389?: CVE-2025-66389 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-66389 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66389?: CVE-2025-66389 affects Microsoft Github Copilot. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66389?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-66389 have an EU (EUVD) identifier?: Yes. CVE-2025-66389 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-210298.
When was CVE-2025-66389 published?: CVE-2025-66389 was published on 2026-06-22 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:microsoft:github_copilot:1.372.0:*:*:*:*:visual_studio_code:*:*

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