{"schema_version": "1.6.1", "id": "CVE-2026-75156", "summary": "FAB Azure AD OAuth: id_token issuer/audience not validated — cross-tenant authentication bypass", "details": "Apache Airflow FAB provider versions 3.7.3 through 3.8.0 do not validate the issuer or audience of Azure AD `id_token`s during OAuth login. Deployments are affected only when the FAB auth manager is configured with Azure AD as an OAuth provider. Because the signing keys are fetched from Microsoft's **multi-tenant** JWKS endpoint, an `id_token` minted in *any* Azure tenant — including one the attacker creates — passes signature verification, and the username and role assignments are then read from that attacker-controlled token. Anyone able to register an Azure tenant can therefore authenticate to the Airflow UI with no prior access to the deployment.\n\nThe fix for **CVE-2026-59243** was incomplete, and this advisory closes the remaining gap: that fix made the provider verify the `id_token` signature, but did not add issuer or audience checks. Operators who already applied the CVE-2026-59243 fix are **still affected and must upgrade again** — 3.7.3 is the release that shipped that fix, so every version containing it falls inside this affected range. Upgrade to apache-airflow-providers-fab `3.8.1` or later.", "affected": [{"ranges": [{"type": "SEMVER", "events": [{"introduced": "3.7.3"}, {"fixed": "3.8.1"}]}]}], "references": [{"type": "WEB", "url": "https://github.com/apache/airflow/pull/71735"}, {"type": "WEB", "url": "https://lists.apache.org/thread/n3l6z4jfdxj4p0t8l7m6olkq6xsc6f76"}, {"type": "WEB", "url": "https://www.cve.org/CVERecord?id=CVE-2026-59243"}]}