CVE-2026-59243criticalCWE-347

CVE-2026-59243: critical vulnerability in Apache Airflow FAB provider

Apache Airflow FAB provider: FAB auth manager: JWT signature verification disabled by default for Azure AD OAuth (`verify_signature` defaults to `False`)

Published · Updated

Follow this CVE+ Monitor Apache Airflow FAB provider

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

48Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 9.8epss 0.6%
from disclosure to weaponsame day
Published on NVDJul 29
1st PoCJul 4
The FAB auth manager's Azure AD OAuth login defaulted `verify_signature=False` when decoding the ID token, so an attacker able to present a forged or unsigned (`alg:none`) ID token to the OAuth callback could bypass authentication and log in as an arbitrary user, including one holding the Admin role (CWE-347). Deployments running the FAB auth manager with the Azure AD OAuth login path under its default configuration are affected; the Authentik path already defaulted to `True`. This issue affects `apache-airflow-providers-fab` before 3.7.3. Users are advised to upgrade to `apache-airflow-providers-fab` 3.7.3, which defaults `verify_signature=True`.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Apache Software Foundation · Apache Airflow FAB provider
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Apache Airflow FAB provider

In the same product, most dangerous first.

CVE-2026-82310HIGHApache Airflow FAB provider: FAB auth manager: deactivated users retain and renew Core API JWT accessEPSS 1.0%CVE-2026-82311CRITICALApache Airflow FAB provider: FAB password reset never invalidates sessions: string/int _user_id comparison is always falseEPSS 1.0%CVE-2026-86462CRITICALApache Airflow FAB provider: FAB Admin password PATCH does not invalidate database-backed sessionsEPSS 0.8%CVE-2026-59245HIGHApache Airflow FAB provider: FAB auth manager: a DAG named "DAGs" hijacks the global all-DAGs permission (access_control privilege escalation via resource_name() collision)EPSS 0.6%CVE-2026-46745MEDIUMApache Airflow FAB provider: LDAP Filter Injection in FAB Auth Manager _search_ldap reachable via /auth/tokenEPSS 0.6%CVE-2026-75156CRITICALApache Airflow FAB provider: FAB Azure AD OAuth: id_token issuer/audience not validated — cross-tenant authentication bypassEPSS 0.4%