{"id":"CVE-2026-75156","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-75156","summary":"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…","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.","published":"2026-09-08T17:18:30.393","modified":"2026-09-08T17:18:30.393","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/apache/airflow/pull/71735","label":"apache/airflow#71735"},"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"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-08T17:18:30.393"}}