CVE-2025-66388: Apache Airflow: Secrets in rendered templates not redacted properly and exposed in the UI

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-15 · updated 2026-10-07
Weakness: CWE-201

Description

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.

Affected products

Apache Airflow: from 3.1.0 before 3.1.4 — fixed in 3.1.4

How to fix

Upgrade to a fixed version: Apache Airflow 3.1.4. Check the vendor advisory for mitigations.

References

https://github.com/apache/airflow/pull/58772
https://lists.apache.org/thread/mv9hzsx8grjf7gdlkxwppnpbtogtls2g
http://www.openwall.com/lists/oss-security/2025/12/12/1

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