Apache Airflow versions 3.0.0 through 3.1.8 DagRun wait endpoint returns XCom result values even to users who only have DAG Run read permissions, such as the Viewer role.This behavior conflicts with the FAB RBAC model, which treats XCom as a separate protected resource, and with the security model documentation that defines the Viewer role as read-only. Airflow uses the FAB Auth Manager to manage access control on a per-resource basis. The Viewer role is intended to be read-only by default, and the security model documentation defines Viewer users as those who can inspect DAGs without accessing sensitive execution results. Users are recommended to upgrade to Apache Airflow 3.2.0 which resolves this issue.
History

Thu, 09 Apr 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 09 Apr 2026 12:30:00 +0000

Type Values Removed Values Added
References

Thu, 09 Apr 2026 09:30:00 +0000

Type Values Removed Values Added
Description Apache Airflow versions 3.0.0 through 3.1.8 DagRun wait endpoint returns XCom result values even to users who only have DAG Run read permissions, such as the Viewer role.This behavior conflicts with the FAB RBAC model, which treats XCom as a separate protected resource, and with the security model documentation that defines the Viewer role as read-only. Airflow uses the FAB Auth Manager to manage access control on a per-resource basis. The Viewer role is intended to be read-only by default, and the security model documentation defines Viewer users as those who can inspect DAGs without accessing sensitive execution results. Users are recommended to upgrade to Apache Airflow 3.2.0 which resolves this issue.
Title Apache Airflow: Authorization bypass in DagRun wait endpoint (XCom exposure)
Weaknesses CWE-668
References

cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-04-09T14:06:21.963Z

Reserved: 2026-03-30T16:07:03.425Z

Link: CVE-2026-34538

cve-icon Vulnrichment

Updated: 2026-04-09T11:21:33.223Z

cve-icon NVD

Status : Received

Published: 2026-04-09T10:16:22.407

Modified: 2026-04-09T15:16:10.563

Link: CVE-2026-34538

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.