What is CVE-2025-66388?

CVE-2025-66388 is a medium-severity vulnerability in Apache Airflow, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 6.5/10. Published 2025-12-15.

How severe is CVE-2025-66388?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Apache Airflow

CVE-2025-66388

A vulnerability in Apache Airflow allowed authenticated UI users to view secret values in rendered templates due to secrets not being properly redacted, potentially exposing secrets to users without the appropriate authorization. Users are recommended to upgrade to version 3.1.4, which fixes this issue.

EPSS: 0.004 (33.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Apache Airflow
Apache Software Foundation Airflow — versions 3.1.0

Weakness classification (CWE)

CWE-201 — Insertion of Sensitive Information into Sent Data

References

security@apache.org (patch, Issue Tracking)
security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2025-66388?: CVE-2025-66388 is a medium-severity vulnerability in Apache Airflow, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 6.5/10. Published 2025-12-15.
How severe is CVE-2025-66388?: Medium severity. CVSS v3 base score is 6.5 out of 10.