CVE-2026-28779: Apache Airflow: Path of session token in cookie does not consider base_url - session hijacking via co-hosted applications

[Rahul Vats <rahulvats () apache org>]

Severity: Medium 

Affected versions:

- Apache Airflow (apache-airflow) 3.0.0 before 3.1.8

Description:

Apache Airflow versions 3.1.0 through 3.1.7 session token (_token) in cookies is set to path=/ regardless of the 
configured [webserver] base_url or [api] base_url.
This allows any application co-hosted under the same domain to capture valid Airflow session tokens from HTTP request 
headers, allowing full session takeover without attacking Airflow itself.

Users are recommended to upgrade to Apache Airflow 3.1.8 or later, which resolves this issue.

Credit:

Daniel Wolf (finder)
Daniel Wolf (remediation developer)

References:

https://github.com/apache/airflow/pull/62771
https://airflow.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-28779