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MEDIUM severity

CVE-2020-17515 — apache-airflow

MEDIUMFix: apache/airflow#14738

CVE-2020-17515 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in apache-airflow. EPSS puts its 30-day exploitation probability at 16.2% (97th percentile). A fix is available for apache-airflow — see the affected versions and patch details below.

Apache Airflow cross-site scripting due to incomplete fix for CVE-2020-13944

Also known asBIT-airflow-2020-17515GHSA-86vp-x3pr-79rxPYSEC-2020-21
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
16.2%probability of exploitation in next 30 days
Moderate Risk0.00%
Lower risk than most CVEs97th percentile — riskier than 97% of all scored CVEsHighest risk
8.38%11.6%14.8%18.0%10.2%16.2%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2020-17515 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

2 pkgs affected
🐍apache-airflow🐍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

The "origin" parameter passed to some of the endpoints like '/trigger' was vulnerable to XSS exploit. This issue affects Apache Airflow versions prior to 1.10.13. This is same as CVE-2020-13944 but the implemented fix in Airflow 1.10.13 did not fix the issue completely.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIapache-airflowall versions1.10.15rc1pip install --upgrade 'apache-airflow==1.10.15rc1'
🐍PyPIapache-airflow≥ 2.0.0b1&&< 2.0.2rc12.0.2rc1pip install --upgrade 'apache-airflow==2.0.2rc1'

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 1.10.15rc1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-17515 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

The "origin" parameter passed to some of the endpoints like '/trigger' was vulnerable to XSS exploit. This issue affects Apache Airflow versions prior to 1.10.13. This is same as CVE-2020-13944 but the implemented fix in Airflow 1.10.13 did not fix the issue completely.
O3 Security · Impact-Aware SCA

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CVE-2020-17515: apache-airflow XSS — Fixed in 1.10.15rc1