{"id":"CVE-2021-26697","aliases":["BIT-airflow-2021-26697","GHSA-fh37-cx83-q542","PYSEC-2021-3"],"url":"https://o3.security/vulnerability/CVE-2021-26697","summary":"Improper Authentication in Apache Airflow","details":"The lineage endpoint of the deprecated Experimental API was not protected by authentication in Airflow 2.0.0. This allowed unauthenticated users to hit that endpoint. This is low-severity issue as the attacker needs to be aware of certain parameters to pass to that endpoint and even after can just get some metadata about a DAG and a Task. This issue only affects Apache Airflow 2.0.0.","published":"2021-02-17T15:15:13.593Z","modified":"2026-08-07T15:15:21.446400Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"apache-airflow","fixedVersion":"2.0.1rc1"}],"fix":{"url":"https://github.com/apache/airflow/commit/21cedff205e7d62675949fda2aa4616d77232b76","label":"apache/airflow@21cedff"},"references":[{"type":"WEB","url":"https://lists.apache.org/thread.html/r36111262a59219a3e2704c71e97cf84937dae5ba7a1da99499e5d8f9%40%3Cannounce.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519%40%3Cdev.airflow.apache.org%3E"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/02/17/2"},{"type":"ADVISORY","url":"https://lists.apache.org/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519%40%3Cusers.airflow.apache.org%3E"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26697"},{"type":"WEB","url":"https://github.com/apache/airflow/commit/21cedff205e7d62675949fda2aa4616d77232b76"},{"type":"WEB","url":"https://github.com/apache/airflow/commit/24a54242d56058846c7978130b3f37ca045d5142"},{"type":"WEB","url":"https://github.com/apache/airflow/commit/93957e917ff4cfb0be11aef088bd9527cf728a04"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-fh37-cx83-q542"},{"type":"PACKAGE","url":"https://github.com/apache/airflow"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2021-3.yaml"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r36111262a59219a3e2704c71e97cf84937dae5ba7a1da99499e5d8f9@%3Cannounce.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519@%3Cdev.airflow.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519@%3Cusers.airflow.apache.org%3E"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T15:15:21.446400Z"}}