{"id":"CVE-2021-26559","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.","aliases":["BIT-airflow-2021-26559","GHSA-ffw3-6mp6-jmvj","PYSEC-2021-2"],"modified":"2026-08-07T15:13:53.663467Z","published":"2021-02-17T15:15:13.500Z","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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/airflow","events":[{"introduced":"8217db8cb4b1ff302c5cf8662477ac00f701e78c"},{"last_affected":"8217db8cb4b1ff302c5cf8662477ac00f701e78c"}],"database_specific":{"extracted_events":[{"introduced":"2.0.0"},{"last_affected":"2.0.0"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:apache:airflow:2.0.0:*:*:*:*:*:*:*"}}],"versions":["2.0.0","providers-zendesk/2.0.0","providers-yandex/2.0.0","providers-vertica/2.0.0","providers-trino/2.0.0","providers-telegram/2.0.0","providers-tableau/2.0.0","providers-ssh/2.0.0","providers-sqlite/2.0.0","providers-snowflake/2.0.0","providers-slack/4.0.0","providers-singularity/2.0.0","providers-sftp/2.0.0","providers-sendgrid/2.0.0","providers-segment/2.0.0","providers-samba/2.0.0","providers-salesforce/3.0.0","providers-redis/2.0.0","providers-qubole/2.0.0","providers-presto/2.0.0","providers-postgres/2.0.0","providers-plexus/2.0.0","providers-papermill/2.0.0","providers-pagerduty/2.0.0","providers-oracle/2.0.0","providers-opsgenie/2.0.0","providers-openfaas/2.0.0","providers-odbc/2.0.0","providers-neo4j/2.0.0","providers-mysql/2.0.0","providers-mongo/2.0.0","providers-microsoft-winrm/2.0.0","providers-microsoft-mssql/2.0.0","providers-microsoft-azure/3.0.0","providers-jira/2.0.0","providers-jenkins/2.0.0","providers-jdbc/2.0.0","providers-imap/2.0.0","providers-http/2.0.0","providers-hashicorp/2.0.0","providers-grpc/2.0.0","providers-google/4.0.0","providers-ftp/2.0.0","providers-facebook/2.0.0","providers-exasol/2.0.0","providers-elasticsearch/2.0.1","providers-docker/2.0.0","providers-discord/2.0.0","providers-dingding/2.0.0","providers-datadog/2.0.0","providers-databricks/2.0.0","providers-cncf-kubernetes/2.0.0","providers-cloudant/2.0.0","providers-celery/2.0.0","providers-asana/1.0.0","providers-apache-sqoop/2.0.0","providers-apache-spark/2.0.0","providers-apache-pinot/2.0.0","providers-apache-pig/2.0.0","providers-apache-livy/2.0.0","providers-apache-kylin/2.0.0","providers-apache-hive/2.0.0","providers-apache-hdfs/2.0.0","providers-apache-druid/2.0.0","providers-apache-cassandra/2.0.0","providers-apache-beam/3.0.0","providers-amazon/2.0.0","providers-airbyte/2.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-26559.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"}]}