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MEDIUM severity

Apache Druid before 0.23.0 vulnerable to reflected XSS via unescaped URL parametersGHSA-8rmv-98m4-g5c6

MEDIUM

GHSA-8rmv-98m4-g5c6 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in org.apache.druid:druid. A fix is available for org.apache.druid:druid — see the affected versions and patch details below.

Also known asCVE-2021-44791
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.3%probability of exploitation in next 30 days
Lower Risk+0.05%
Lower risk than most CVEs83th percentile — riskier than 83% of all scored CVEsHighest risk
0.71%2.87%5.03%7.19%6.0%2.3%May 26Sep 26Nov 26

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

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
☕org.apache.druid:druid

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

Description

In Apache Druid 0.22.1 and earlier, certain specially-crafted links result in unescaped URL parameters being sent back in HTML responses. This makes it possible to execute reflected XSS attacks. This issue is patched in version 0.23.0.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.druid:druidall versions0.23.0org.apache.druid:druid:0.23.0

Affected Products

1 product · 1 configurations
Application
druidapache
≤ 0.22.1
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 org.apache.druid:druid, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.druid:druid to 0.23.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8rmv-98m4-g5c6 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 Druid 0.22.1 and earlier, certain specially-crafted links result in unescaped URL parameters being sent back in HTML responses. This makes it possible to execute reflected XSS attacks. This issue is patched in version 0.23.0.
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Apache Druid before 0.23.0 vulnerable to reflected XSS…