Executive Summary

[{'type': 'paragraph', 'content': "The vulnerability in CVE-2026-25604 involves the AWS Auth manager in Apache Airflow insecurely handling the origin of SAML authentication. Specifically, it used the 'host' parameter provided by the client in incoming requests without verifying it against the actual instance URL. This allowed attackers to reuse a SAML response from one instance to gain unauthorized access to different instances that might have different access controls."}, {'type': 'paragraph', 'content': "The issue was fixed by changing the system to use the 'host' value from the trusted configuration rather than from the client request, preventing host header manipulation attacks."}] [1]

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Impact Analysis

This vulnerability can allow an attacker to gain unauthorized access to multiple Apache Airflow instances by reusing a valid SAML authentication response from one instance on others. This could lead to exposure of sensitive data, unauthorized actions, and potential compromise of workflows or systems managed by those Airflow instances.

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Compliance Impact

I don't know

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Detection Guidance

This vulnerability involves insecure handling of the `host` parameter in the AWS authentication manager, where the host value is taken directly from incoming requests instead of a trusted configuration.

To detect this vulnerability on your system, you can check if your AWS Auth Manager implementation uses the host value from incoming requests rather than from a fixed configuration.

While no specific commands are provided, you can audit your Apache Airflow AWS Auth Manager code or configuration for usage of the `host` parameter sourced from request headers.

Additionally, monitoring network traffic for unusual reuse of SAML responses across different instances could indicate exploitation attempts.

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Mitigation Strategies

The primary mitigation step is to upgrade your Apache Airflow AWS Auth Manager to version 9.22.0 or later, where the vulnerability has been fixed.

This update changes the AWS authentication manager to use the host value from a trusted configuration instead of the incoming request, preventing host header manipulation.

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