Read the docs
TI-2026-63711 Aliases CVE-2026-95846

Moquette publishes Last-Will messages without enforcing write authorization

Priority HIGH 77CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, PostOffice.publishWill publishes a client's Last-Will message without applying the canWrite authorization and reserved-topic checks used for a normal PUBLISH. A client can configure a Will for a topic that the client is not permitted to write and cause the broker to publish the unauthorized message when the client disconnects unexpectedly. This issue allows unauthorized message injection into restricted topics. This issue is fixed in version 0.18.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00319 25th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed moquette (moquette-io): 0.18.1

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

VendorProductAffected versionsFixed inStatusSource
moquette-iomoquettebefore 0.18.10.18.1Patch availableCNA
  • moquette Vendormoquette-io Affected before 0.18.1 Fixed in 0.18.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:moquette:moquette:*:*:*:*:*:*:*:*before 0.18.1Vulnerablemoquette-io
  • cpe:2.3:a:moquette:moquette:*:*:*:*:*:*:*:* Versions before 0.18.1 Vulnerable ·moquette-io

Remediation

  • Fix · CNA moquette (moquette-io) Fixed in 0.18.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-95846

References

Exploit 1

Patch 1

Other 1

  • 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-2026-63709 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
  • TI-2026-58826 Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass CVSS 3.1CRITICAL 9.6
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences