CVE-2026-75156

{"id": "CVE-2026-75156", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-75156", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-09-08T18:59:35.794768Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security@apache.org", "affectedData": [{"vendor": "Apache Software Foundation", "product": "Apache Airflow FAB provider", "versions": [{"status": "affected", "version": "3.7.3", "lessThan": "3.8.1", "versionType": "semver"}], "packageURL": "pkg:pypi/apache-airflow-providers-fab", "packageName": "apache-airflow-providers-fab", "collectionURL": "https://pypi.python.org", "defaultStatus": "unaffected"}]}], "published": "2026-09-08T17:18:30.393", "references": [{"url": "https://github.com/apache/airflow/pull/71735", "tags": ["Patch", "Vendor Advisory"], "source": "security@apache.org"}, {"url": "https://lists.apache.org/thread/n3l6z4jfdxj4p0t8l7m6olkq6xsc6f76", "tags": ["Mailing List"], "source": "security@apache.org"}, {"url": "https://www.cve.org/CVERecord?id=CVE-2026-59243", "tags": ["Third Party Advisory"], "source": "security@apache.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security@apache.org", "description": [{"lang": "en", "value": "CWE-346"}]}], "descriptions": [{"lang": "en", "value": "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 \u2014 including one the attacker creates \u2014 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** \u2014 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."}], "lastModified": "2026-09-18T14:25:21.873", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:apache:apache-airflow-providers-fab:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AD71AA7E-89E0-4D2F-A83C-D10EFD7EEEBF", "versionEndExcluding": "3.8.1", "versionStartIncluding": "3.7.3"}], "operator": "OR"}]}], "sourceIdentifier": "security@apache.org"}