Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Moquette broker (io.moquette:moquette-broker) versions before 0.18.1 are affected. Any connecting MQTT client can bypass pattern-based ACL rules across tenants when those rules are configured, crash the broker with malformed subscriptions, or publish Last-Will messages without authorization. Upgrade to 0.18.1.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.7 | High | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0044, the 38th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:16 UTC First seen by agentprime
- 31 Oct 2026, 14:16 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-5f42-97gr-vfhq
- OSV: GHSA-5f42-97gr-vfhq
- github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq
- nvd.nist.gov/vuln/detail/CVE-2026-85724
- github.com/moquette-io/moquette/pull/959
- github.com/moquette-io/moquette/pull/958
- github.com/moquette-io/moquette/pull/957
- github.com/moquette-io/moquette/commit/f5a323fe782d1505c0097498cb22eb6ec6c96973
- github.com/moquette-io/moquette/commit/d77753542e262b7aa573dee3c2b05e44439bbd96
- github.com/moquette-io/moquette/commit/ca17e0be19e86d5e291f4532dfdc94616c8e0049
- github.com/moquette-io/moquette/commit/c65b3e90fa03e562e2c2fa69c3ee916c2cbfbd2b
- github.com/moquette-io/moquette/commit/b4a98bb3f3425ece476ed073aa080c627c1239af
- github.com/moquette-io/moquette/commit/affdc71fdba92dc020421678970ae70518fb6da2
- github.com/moquette-io/moquette/commit/86feb7c31e6fac849c465d8079d08c0e7ef01cdf