{"id":"CVE-2021-26559","aliases":["BIT-airflow-2021-26559","GHSA-ffw3-6mp6-jmvj","PYSEC-2021-2"],"url":"https://o3.security/vulnerability/CVE-2021-26559","summary":"Improper Access Control in Apache Airflow","details":"Improper Access Control on Configurations Endpoint for the Stable API of Apache Airflow allows users with Viewer or User role to get Airflow Configurations including sensitive information even when `[webserver] expose_config` is set to `False` in `airflow.cfg`. This allowed a privilege escalation attack. This issue affects Apache Airflow 2.0.0.","published":"2021-02-17T15:15:13.500Z","modified":"2026-08-07T15:13:53.663467Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"apache-airflow","fixedVersion":"2.0.1rc1"}],"fix":null,"references":[{"type":"WEB","url":"https://lists.apache.org/thread.html/rd142565996d7ee847b9c14b8a9921dcf80bc6bc160e3d9dca6dfc2f8%40%3Cannounce.apache.org%3E"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/02/17/1"},{"type":"ADVISORY","url":"https://lists.apache.org/thread.html/r3b3787700279ec361308cbefb7c2cce2acb26891a12ce864e4a13c8d%40%3Cusers.airflow.apache.org%3E"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T15:13:53.663467Z"}}