CVE-2026-59243

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`.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/apache/airflow/pull/69374	Patch
https://lists.apache.org/thread/x4784l7z00tl3gw4tv2dmvoon77rxgpl	Mailing List Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/07/28/10	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:apache:apache-airflow-providers-fab:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-29 10:16

Updated : 2026-09-16 15:17

NVD link : CVE-2026-59243

Mitre link : CVE-2026-59243

CVE.ORG link : CVE-2026-59243

JSON object : View

Products Affected

apache

apache-airflow-providers-fab

CWE

CWE-347

Improper Verification of Cryptographic Signature

{"id": "CVE-2026-59243", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-59243", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-07-29T15:29:52.670228Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security@apache.org", "affectedData": [{"vendor": "Apache Software Foundation", "product": "Apache Airflow FAB provider", "versions": [{"status": "affected", "version": "0", "lessThan": "3.7.3", "versionType": "semver"}], "packageURL": "pkg:pypi/apache-airflow-providers-fab", "packageName": "apache-airflow-providers-fab", "collectionURL": "https://pypi.python.org", "defaultStatus": "unaffected"}]}], "published": "2026-07-29T10:16:44.390", "references": [{"url": "https://github.com/apache/airflow/pull/69374", "tags": ["Patch"], "source": "security@apache.org"}, {"url": "https://lists.apache.org/thread/x4784l7z00tl3gw4tv2dmvoon77rxgpl", "tags": ["Mailing List", "Vendor Advisory"], "source": "security@apache.org"}, {"url": "http://www.openwall.com/lists/oss-security/2026/07/28/10", "tags": ["Mailing List", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security@apache.org", "description": [{"lang": "en", "value": "CWE-347"}]}], "descriptions": [{"lang": "en", "value": "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`."}], "lastModified": "2026-09-16T15:17:39.093", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:apache:apache-airflow-providers-fab:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8594BF55-DBE6-418C-81A1-4B595EEE9DB7", "versionEndExcluding": "3.7.3"}], "operator": "OR"}]}], "sourceIdentifier": "security@apache.org"}