CVE-2026-25604 Apache Software Foundation CVE debrief

Who should care

Organizations using Apache Airflow Providers Amazon, especially those with multiple instances and varying access controls, should prioritize upgrading to version 9.22.0. This vulnerability could allow attackers to move laterally across instances, potentially escalating privileges or accessing sensitive data.

Technical summary

The vulnerability exists in the AWS Auth manager's handling of SAML authentication responses. By not verifying the origin of these responses, an attacker could reuse a SAML response from one instance on another, potentially bypassing access controls. This issue is particularly concerning for environments with multiple Airflow instances, each with different access controls. The vulnerability is addressed in version 9.22.0 of the Apache Airflow Providers Amazon.

Defensive priority

Upgrade to version 9.22.0 of Apache Airflow Providers Amazon. Review and adjust access controls across Airflow instances to ensure least privilege access.

Recommended defensive actions

• Upgrade to Apache Airflow Providers Amazon version 9.22.0 or later.
• Review and adjust access controls across Airflow instances to ensure least privilege access.
• Monitor for unusual SAML authentication activity across Airflow instances.
• Implement additional logging and monitoring for AWS Auth manager activities.
• Consider compensating controls, such as IP restrictions or additional authentication factors, for sensitive instances.

Evidence notes

The CVE-2026-25604 vulnerability was publicly disclosed on March 9, 2026, and last modified on July 2, 2026. The issue was identified and reported through the Apache security mailing list. The CVSS score of 5.4 indicates a medium-severity vulnerability. The CWE-346 classification highlights the improper verification of authentication mechanisms.

Official resources