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MEDIUM severity

CVE-2020-13944 — apache-airflow

MEDIUMFix: apache/airflow@5c2bb7b

CVE-2020-13944 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in apache-airflow. EPSS puts its 30-day exploitation probability at 25.1% (98th percentile). A fix is available for apache-airflow — see the affected versions and patch details below.

Apache Airflow Cross-site Scripting

Also known asBIT-airflow-2020-13944GHSA-4pwq-fj89-6rjcPYSEC-2020-19
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
25.1%probability of exploitation in next 30 days
Moderate Risk0.00%
Lower risk than most CVEs98th percentile — riskier than 98% of all scored CVEsHighest risk
14.9%19.1%23.2%27.4%17.2%25.1%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2020-13944 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐍apache-airflow

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

In Apache Airflow < 1.10.12, the origin parameter passed to some of the endpoints like /trigger and was vulnerable to a XSS exploit.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIapache-airflowall versions1.10.12pip install --upgrade 'apache-airflow==1.10.12'

Affected Products

1 product · 2 configurations
Application
airflowapache
≥ 2.0.0 && < 2.0.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for apache-airflow, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update apache-airflow to 1.10.12 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-13944 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

In Apache Airflow < 1.10.12, the `origin` parameter passed to some of the endpoints like `/trigger` and was vulnerable to a XSS exploit.
O3 Security · Impact-Aware SCA

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CVE-2020-13944: apache-airflow XSS — Fixed in 1.10.12