{"id":"CVE-2021-26697","aliases":["BIT-airflow-2021-26697","EUVD-2021-0015","GHSA-fh37-cx83-q542","PYSEC-2021-3"],"status":"published","title":"Apache Airflow: Lineage API endpoint for Experimental API missed authentication check","description":"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 affects Apache Airflow 2.0.0.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.0461,"percentile":0.91803,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-269","CWE-287","CWE-306"],"published":"2021-02-17T14:15:15Z","modified":"2026-10-24T10:31:05Z","fixes":[{"ecosystem":"PyPI","package":"apache-airflow","fixed_in":["2.0.1rc1","2.0.1"],"sources":["ghsa","osv"]},{"ecosystem":"Bitnami","package":"airflow","fixed_in":["2.0.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"apache-airflow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.0"},{"last_affected":"2.0.0"},{"fixed":"2.0.1rc1"}]}],"versions":["2.0.0"]},{"source":"osv","ecosystem":"Bitnami","package":"airflow","ranges":[{"type":"SEMVER","events":[{"introduced":"2.0.0"},{"fixed":"2.0.1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"apache-airflow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.0"},{"fixed":"2.0.1rc1"}]}],"versions":["2.0.0"]},{"source":"osv","ecosystem":"PyPI","package":"apache-airflow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.1"}]}],"versions":["1.8.1","1.8.2rc1","1.8.2","1.9.0","1.10.0","1.10.1b1","1.10.1rc2","1.10.1","1.10.2b2","1.10.2rc1","1.10.2rc2","1.10.2rc3","1.10.2","1.10.3b1","1.10.3b2","1.10.3rc1","1.10.3rc2","1.10.3","1.10.4b2","1.10.4rc1","1.10.4rc2","1.10.4rc3","1.10.4rc4","1.10.4rc5","1.10.4","1.10.5rc1","1.10.5","1.10.6rc1","1.10.6rc2","1.10.6","1.10.7rc1","1.10.7rc2","1.10.7rc3","1.10.7","1.10.8rc1","1.10.8","1.10.9rc1","1.10.9","1.10.10rc1","1.10.10rc2","1.10.10rc3","1.10.10rc4","1.10.10rc5","1.10.10","1.10.11rc1","1.10.11rc2","1.10.11","1.10.12rc1","1.10.12rc2","1.10.12rc3","1.10.12rc4","1.10.12","1.10.13rc1","1.10.13","1.10.14rc1","1.10.14rc2","1.10.14rc3","1.10.14rc4","1.10.14","1.10.15rc1","1.10.15","2.0.0b1","2.0.0b2","2.0.0b3","2.0.0rc1","2.0.0rc2","2.0.0rc3","2.0.0","2.0.1rc1","2.0.1rc2"]}],"products":[{"vendor":"apache","product":"airflow"},{"vendor":"apache software foundation","product":"apache airflow"}],"references":[{"url":"https://lists.apache.org/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519%40%3Cusers.airflow.apache.org%3E","tags":["x_refsource_MISC","mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory","web"]},{"url":"http://www.openwall.com/lists/oss-security/2021/02/17/2","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory","web"]},{"url":"https://lists.apache.org/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519%40%3Cdev.airflow.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/r36111262a59219a3e2704c71e97cf84937dae5ba7a1da99499e5d8f9%40%3Cannounce.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26697","tags":["web","advisory"]},{"url":"https://github.com/apache/airflow/commit/21cedff205e7d62675949fda2aa4616d77232b76","tags":["web"]},{"url":"https://lists.apache.org/thread.html/r36111262a59219a3e2704c71e97cf84937dae5ba7a1da99499e5d8f9@%3Cannounce.apache.org%3E","tags":["web"]},{"url":"https://lists.apache.org/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519@%3Cdev.airflow.apache.org%3E","tags":["web"]},{"url":"https://lists.apache.org/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519@%3Cusers.airflow.apache.org%3E","tags":["web"]},{"url":"https://github.com/apache/airflow/commit/24a54242d56058846c7978130b3f37ca045d5142","tags":["web"]},{"url":"https://github.com/apache/airflow/commit/93957e917ff4cfb0be11aef088bd9527cf728a04","tags":["web"]},{"url":"https://github.com/advisories/GHSA-fh37-cx83-q542","tags":["advisory"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2021-3.yaml","tags":["web"]},{"url":"https://github.com/apache/airflow","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-26697","title":"Apache Airflow: Lineage API endpoint for Experimental API missed authentication check","description":"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 affects Apache Airflow 2.0.0.","status":"published","published":"2021-02-17T14:15:15Z","modified":"2025-02-13T16:27:54.957Z","cwes":["CWE-269"],"updated_at":"2026-11-02T14:32:57.368269Z"}],"euvd":[{"id":"EUVD-2021-0015","description":"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 affects Apache Airflow 2.0.0.","status":"published","published":"2021-02-17T14:15:15Z","modified":"2025-02-13T16:27:54Z","cvss":[{"version":"","score":0,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"none"}],"updated_at":"2026-11-03T00:03:53.290549Z"}],"ghsa":[{"id":"GHSA-fh37-cx83-q542","title":"Improper Authentication in Apache Airflow","description":"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.","status":"published","published":"2021-06-18T18:30:11Z","modified":"2024-09-12T20:10:22Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-269","CWE-287","CWE-306"],"updated_at":"2026-11-02T14:38:02.014847Z"}],"nvd":[{"id":"CVE-2021-26697","description":"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 affects Apache Airflow 2.0.0.","status":"published","published":"2021-02-17T15:15:13.593Z","modified":"2026-06-17T03:43:40.357Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-269","CWE-306"],"updated_at":"2026-11-02T14:06:50.031227Z"}],"osv":[{"id":"CVE-2021-26697","description":"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 affects Apache Airflow 2.0.0.","status":"published","published":"2021-02-17T15:15:13.593Z","modified":"2026-10-24T10:31:05.85326561Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:18.778776Z"},{"id":"GHSA-fh37-cx83-q542","title":"Improper Authentication in Apache Airflow","description":"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.","status":"published","published":"2021-06-18T18:30:11Z","modified":"2024-09-12T20:10:22Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"},{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-269","CWE-287","CWE-306"],"updated_at":"2026-11-02T15:46:46.39441Z"},{"id":"BIT-airflow-2021-26697","title":"Apache Airflow: Lineage API endpoint for Experimental API missed authentication check","description":"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 affects Apache Airflow 2.0.0.","status":"published","published":"2024-03-06T10:59:36.299Z","modified":"2026-09-08T08:45:19.62510694Z","updated_at":"2026-11-02T15:28:28.267217Z"},{"id":"PYSEC-2021-3","description":"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 affects Apache Airflow 2.0.0.","status":"published","published":"2021-02-17T15:15:00Z","modified":"2023-12-06T01:00:58.60169Z","updated_at":"2026-11-02T15:52:52.682031Z"}]}}