{"id":"BIT-airflow-2026-82355","summary":"Apache Airflow: Session cookie silently overrides explicit Authorization bearer header, enabling session fixation","details":"When a request to the Airflow core API carries both a session cookie and an explicit `Authorization: Bearer` token, Airflow resolves the caller from the cookie and ignores the bearer token, inverting the intended precedence of bearer over cookie. The request then executes -- and is recorded in the audit log -- as the cookie's principal rather than the identity the client explicitly presented.\n\nOnly Apache Airflow 3.3.0 and 3.3.1 are affected. Earlier releases do not contain the code path that caches the cookie-derived user, and are not vulnerable.\n\nExploiting this requires an attacker to first place a valid session cookie of their own into the victim's browser or client: for example by cookie tossing from a sibling subdomain, through cross-site scripting in a separate application sharing a parent domain, or via a shared workstation. Deployments that host the Airflow UI on a domain shared with other applications are therefore the most exposed; a deployment on a dedicated domain with no co-hosted applications is not reachable this way. The consequence is principal confusion and misattributed audit records rather than a direct privilege escalation.\n\nUsers of 3.3.0 or 3.3.1 should upgrade to Apache Airflow 3.3.2 or later, which resolves the caller from the explicitly supplied credential whenever one is present.","aliases":["CVE-2026-82355","PYSEC-2026-3989"],"modified":"2026-09-26T09:25:59.744943687Z","published":"2026-09-26T08:41:41.787Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2026/09/21/4"},{"type":"FIX","url":"https://github.com/apache/airflow/pull/72225"},{"type":"FIX","url":"https://github.com/apache/airflow/pull/72723"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/3p7zpdvv40tn01m0xk5mt2rxg88mw8w1"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-82355"}],"affected":[{"package":{"name":"airflow","ecosystem":"Bitnami","purl":"pkg:bitnami/airflow"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.3.0"},{"fixed":"3.3.2"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/airflow/BIT-airflow-2026-82355.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N"}]}],"schema_version":"1.9.0"}