EUVD-2026-50216
GHSA-q5r3-w69r-hrfw
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-accessible endpoint, trivial token forgery (low complexity), no privileges or user interaction required, full compromise of confidentiality, integrity, and availability.
Primary rating from Vendor (CNA).
CVSS VectorVendor
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4Description PRE-NVD
Articles & Coverage 1
AnalysisAI
Authentication bypass in Apache Airflow FAB provider allows unauthenticated attackers to log in as any user (including Admin) by sending a forged Azure AD ID token to the OAuth callback endpoint. This affects default deployments of the FAB auth manager with Azure AD OAuth login enabled, prior to version 3.7.3. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target deployment must use the Apache Airflow FAB auth manager with Azure AD OAuth login enabled in its default configuration (i.e., without explicitly setting `verify_signature=True`). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | While Apache classifies this as moderate, independent CVSS analysis yields a critical 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) because an attacker with network access to the OAuth callback can gain admin privileges with trivial effort (forging a token requires no authentication or user interaction). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker identifies an Airflow instance using the FAB auth manager with Azure AD OAuth. After constructing a JWT with `alg:none` and an `email` or username claim matching an existing Admin account, the attacker submits the token to the /oauth-authorized/azure callback URL. … |
| Remediation | Upgrade to `apache-airflow-providers-fab` version 3.7.3 or later, which changes the default to `verify_signature=True`. … Detailed patch versions, workarounds, and compensating controls in full report. |
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