Apache Airflow AWS Auth Manager has Host Header Injection Leading to SAML Authentication Bypass
Date: 2026-03
Affected: pip/apache-airflow-providers-amazon
Attack vector: auth-bypass
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-25604
CWE: CWE-346
CVSS: 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)

In AWS Auth manager, the origin of the SAML authentication has been used as provided by the client and not verified against the actual instance URL. This allowed to gain access to different instances with potentially different access controls by reusing SAML response from other instances. You should upgrade to 9.22.0 version of provider if you use AWS Auth Manager.


Mitigations:

Architectural layers (MAESTRO):