Moquette: Missing Authorization in io.moquette:moquette-broker
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.
Summary
Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, PostOffice.publishWill publishes a client-controlled Last Will message through publish2Subscribers without invoking the authorizator.canWrite check used by normal PUBLISH paths. When anonymous access is enabled and topic ACLs restrict writes, a remote client can set an ACL-protected topic as the Last Will Topic during CONNECT and perform an abnormal client disconnect, causing the broker to inject attacker-controlled messages into a topic for which the client lacks write permission. This issue is fixed in version 0.18.1.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| moquette-io | moquette | before 0.18.1 | 0.18.1 | Patch available | CNA |
| — | io.moquette:moquette-broker (Maven) | before 0.18.1 | 0.18.1 | Patch available | GHSA-9jjc-fw8x-fmwx |
- moquette Vendormoquette-io Affected before 0.18.1 Fixed in 0.18.1 Patch available CNA
- io.moquette:moquette-broker (Maven) Vendor— Affected before 0.18.1 Fixed in 0.18.1 Patch available GHSA-9jjc-fw8x-fmwx
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:moquette:moquette:*:*:*:*:*:*:*:* | — | — | moquette-io |
- cpe:2.3:a:moquette:moquette:*:*:*:*:*:*:*:* Versions — — ·moquette-io
Remediation
- Fix · CNA moquette (moquette-io) Fixed in 0.18.1
- Fix · GHSA-9jjc-fw8x-fmwx io.moquette:moquette-broker (Maven) Fixed in 0.18.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-85058
- 2026-10-03 Alias added: GHSA-9jjc-fw8x-fmwx
References
Other 5
- https://github.com/moquette-io/moquette/security/advisories/GHSA-9jjc-fw8x-fmwx
- https://github.com/moquette-io/moquette/commit/e23df019f6a11e22c7d2047d4f86d07095466c97
- https://github.com/moquette-io/moquette/commit/f5a323fe782d1505c0097498cb22eb6ec6c96973
- https://github.com/moquette-io/moquette/releases/tag/v0.18.1
- https://github.com/moquette-io/moquette
More moquette-io vulnerabilities
- TI-2026-63713 Moquette fails open when configured authentication or authorization classes cannot load CVSS 4.0CRITICAL 9.3
- TI-2026-63712 Moquette client IDs can cause cross-session H2 durable-queue corruption CVSS 4.0HIGH 8.8
- TI-2026-63711 Moquette publishes Last-Will messages without enforcing write authorization CVSS 4.0HIGH 8.7
- TI-2026-63709 Moquette deeply nested MQTT topics can cause stack exhaustion CVSS 4.0HIGH 8.7
- TI-2026-63708 Moquette malformed shared subscriptions can crash command processing CVSS 4.0HIGH 8.7
- TI-2026-63707 Moquette uncaught MQTT command exceptions can terminate shared session event loops CVSS 4.0HIGH 8.7
Sources
- CVE-2026-85058 · CVE Program
- CVE-2026-85058 · NVD
- FIRST EPSS
- GHSA-9jjc-fw8x-fmwx · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences