{"schema_version": "1.6.1", "id": "CVE-2026-59243", "summary": "FAB auth manager: JWT signature verification disabled by default for Azure AD OAuth (`verify_signature` defaults to `False`)", "details": "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`.", "affected": [{"ranges": [{"type": "SEMVER", "events": [{"introduced": "0"}, {"fixed": "3.7.3"}]}]}], "references": [{"type": "WEB", "url": "https://github.com/apache/airflow/pull/69374"}, {"type": "WEB", "url": "https://lists.apache.org/thread/x4784l7z00tl3gw4tv2dmvoon77rxgpl"}]}