Vulnerability Description
Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, when pattern-based ACL rules are configured, AuthorizationsCollector.canDoOperation substitutes client ID and username values directly into rules containing %c or %u and then treats the result as an MQTT topic filter. A client that uses + or # in either identity can broaden the substituted filter and gain cross-tenant read and write access. A # identity can also produce an invalid filter that triggers a NullPointerException in Topic.match and disrupts session processing. This issue is fixed in version 0.18.1.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Moquette | Moquette | < 0.18.1 |
Related Weaknesses (CWE)
References
- https://github.com/moquette-io/moquette/commit/b4a98bb3f3425ece476ed073aa080c627Patch
- https://github.com/moquette-io/moquette/releases/tag/v0.18.1Release Notes
- https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhqExploitMitigationVendor Advisory
- https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhqExploitMitigationVendor Advisory
FAQ
What is CVE-2026-85724?
CVE-2026-85724 is a vulnerability with a CVSS score of 9.6 (CRITICAL). Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, when pattern-based ACL rules are configured, AuthorizationsCollector.canDoOperation substitutes client ID and username values directly into...
How severe is CVE-2026-85724?
CVE-2026-85724 has been rated CRITICAL with a CVSS base score of 9.6/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-85724?
Check the references section above for vendor advisories and patch information. Affected products include: Moquette Moquette.