{"id":"CVE-2026-75156","title":"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","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 auth manager is configured with Azure AD as an OAuth p…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-346"],"vendor":"apache","product":"apache-airflow-providers-fab","affected":["apache-airflow-providers-fab >= 3.7.3, < 3.8.1"],"patched":["apache-airflow-providers-fab 3.8.1"],"published":"2026-09-08","updated":"2026-09-18","sourceUpdated":"2026-09-18T14:25:21.873","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-75156","references":[{"url":"https://github.com/apache/airflow/pull/71735","label":"security@apache.org"},{"url":"https://lists.apache.org/thread/n3l6z4jfdxj4p0t8l7m6olkq6xsc6f76","label":"security@apache.org"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-59243","label":"security@apache.org"}],"tags":["nvd","cve.org"],"epss":0.00274,"epssPercentile":0.19959,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-08T18:59:35.794768Z"},"ingestedAt":"2026-09-08T19:08:49.600Z","slug":"CVE-2026-75156","body":"## Overview\n\nApache 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.\n\n## Affected\n\n- `apache-airflow-providers-fab >= 3.7.3, < 3.8.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `apache-airflow-providers-fab 3.8.1`","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":5709,"id":"CVE-2026-75156","ts":1788894564858,"field":"cvss","old":null,"new":"9.1"},{"seq":5708,"id":"CVE-2026-75156","ts":1788894564858,"field":"severity","old":"none","new":"critical"}]}