CVE-2021-26559 json
CWE-284 Improper Access Control on Configurations Endpoint for the Stable API
published 5y ago modified 2mo ago also BIT-airflow-2021-26559 , EUVD-2021-0014 , GHSA-ffw3-6mp6-jmvj , PYSEC-2021-2
- cvss
- 6.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.8%
- EPSS 2.8% chance of exploitation in 30 days, percentile 86%
- public exploits
- 0
- none known
Summary
Improper Access Control on Configurations Endpoint for the Stable API of Apache Airflow allows users with Viewer or User role to get Airflow Configurations including sensitive information even when `[webserver] expose_config` is set to `False` in `airflow.cfg`. This allowed a privilege escalation attack. This issue affects Apache Airflow 2.0.0.
Patch / fix
- pypi apache-airflow 2.0.1, 2.0.1rc1
- bitnami airflow 2.0.1
Is CVE-2021-26559 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
2.81% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:P/I:N/A:N |
| OSV | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | apache-airflow | >=2.0.0, <2.0.1rc1 <2.0.1 |
2.0.1rc1 2.0.1 |
| bitnami | airflow | >=2.0.0, <2.0.1 |
2.0.1 |
Affected products
- Apache Software Foundation Apache Airflow
Classification
References
-
github.com
/apache/airflow/commit/3909232fafd09ac72b49010ecdfd6ea48f06d5cf
web
-
github.com
/apache/airflow/commit/5e35926c7eda0dfa11a9623e4bf5f60c2bd6b3f6
web
-
lists.apache.org
/thread.html/r3b3787700279ec361308cbefb7c2cce2acb26891a12ce864e4a13c8d%40%3Cusers.airflow.apache.org%3E
web, mailing-list, vendor-advisory, advisory
-
openwall.com
/lists/oss-security/2021/02/17/1
mailing-list, web, third-party-advisory, advisory
-
lists.apache.org
/thread.html/rd142565996d7ee847b9c14b8a9921dcf80bc6bc160e3d9dca6dfc2f8%40%3Cannounce.apache.org%3E
mailing-list, web
-
nvd.nist.gov
/vuln/detail/CVE-2021-26559
advisory, web
-
github.com
/advisories/GHSA-ffw3-6mp6-jmvj
advisory
-
github.com
/apache/airflow
package
-
github.com
/apache/airflow/blob/486b76438c0679682cf98cb88ed39c4b161cbcc8/CHANGELOG.txt
web
-
github.com
/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2021-2.yaml
web
-
lists.apache.org
/thread.html/rd142565996d7ee847b9c14b8a9921dcf80bc6bc160e3d9dca6dfc2f8@%3Cannounce.apache.org%3E
web
Sources
- CVE List CVE-2021-26559
- GitHub Advisory GHSA-ffw3-6mp6-jmvj
- NVD CVE-2021-26559
- OSV BIT-airflow-2021-26559
- OSV PYSEC-2021-2
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.