GHSA-HHX9-P69V-CX2J

Vulnerability from github – Published: 2021-04-30 17:34 – Updated: 2025-10-22 17:56
VLAI?
Summary
Authentication bypass in Apache Airflow
Details

The previous default setting for Airflow's Experimental API was to allow all API requests without authentication, but this poses security risks to users who miss this fact. From Airflow 1.10.11 the default has been changed to deny all requests by default and is documented at https://airflow.apache.org/docs/1.10.11/security.html#api-authentication. Note this change fixes it for new installs but existing users need to change their config to default [api]auth_backend = airflow.api.auth.backend.deny_all as mentioned in the Updating Guide: https://github.com/apache/airflow/blob/1.10.11/UPDATING.md#experimental-api-will-deny-all-request-by-default

Severity ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "apache-airflow"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.10.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-13927"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1056",
      "CWE-1188",
      "CWE-287",
      "CWE-306"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-04-20T19:30:46Z",
    "nvd_published_at": "2020-11-10T16:15:00Z",
    "severity": "CRITICAL"
  },
  "details": "The previous default setting for Airflow\u0027s Experimental API was to allow all API requests without authentication, but this poses security risks to users who miss this fact. From Airflow 1.10.11 the default has been changed to deny all requests by default and is documented at https://airflow.apache.org/docs/1.10.11/security.html#api-authentication. Note this change fixes it for new installs but existing users need to change their config to default `[api]auth_backend = airflow.api.auth.backend.deny_all` as mentioned in the Updating Guide: https://github.com/apache/airflow/blob/1.10.11/UPDATING.md#experimental-api-will-deny-all-request-by-default",
  "id": "GHSA-hhx9-p69v-cx2j",
  "modified": "2025-10-22T17:56:14Z",
  "published": "2021-04-30T17:34:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-13927"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/airflow/pull/9611"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/airflow/commit/180bca4f993b7b778a8d2c65d3d357652218922b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/airflow/commit/9e305d6b810a2a21e2591a80a80ec41acb3afed0"
    },
    {
      "type": "WEB",
      "url": "https://airflow.apache.org/docs/apache-airflow/1.10.11/security.html#api-authentication"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-hhx9-p69v-cx2j"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/airflow"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/airflow/releases/tag/1.10.11"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2020-18.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r23a81b247aa346ff193670be565b2b8ea4b17ddbc7a35fc099c1aadd%40%3Cdev.airflow.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-13927"
    },
    {
      "type": "WEB",
      "url": "http://packetstormsecurity.com/files/162908/Apache-Airflow-1.10.10-Remote-Code-Execution.html"
    },
    {
      "type": "WEB",
      "url": "http://packetstormsecurity.com/files/174764/Apache-Airflow-1.10.10-Remote-Code-Execution.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Authentication bypass in Apache Airflow"
}


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