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.

Published 2025-12-15 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.005 (38.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000

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

github.com/apache/airflow/pull/58772 (patch, Issue Tracking)
lists.apache.org/thread/mv9hzsx8grjf7gdlkxwppnpbtogtls2g (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.