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TI-2026-58826 Aliases CVE-2026-85724GHSA-5f42-97gr-vfhq

Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass

Priority HIGH 76CWE-155Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00316 24th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed moquette (moquette-io): 0.18.1io.moquette:moquette-broker (Maven): 0.18.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

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
—io.moquette:moquette-broker (Maven)before 0.18.10.18.1Patch availableGHSA-5f42-97gr-vfhq
  • 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-5f42-97gr-vfhq

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
  • Fix · GHSA-5f42-97gr-vfhq io.moquette:moquette-broker (Maven) Fixed in 0.18.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-85724
  2. 2026-10-03 Alias added: GHSA-5f42-97gr-vfhq
  3. 2026-10-20 Weakness changed · GHSA-5f42-97gr-vfhq
  4. 2026-10-20 1 new reference · GHSA-5f42-97gr-vfhq

References

Exploit 1

Patch 1

Advisory 1

Other 14

  • 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
See all 7 →

Sources

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