CVE-2026-85724Network attack vectorHinoki check available

Cross-tenant authorization bypass via ACL wildcard injection

Published Sep 23, 2026 · Updated Sep 23, 2026

Authorization bypass in Moquette 0.18.0 and earlier allows remote attackers to read and write cross-tenant MQTT topics via crafted identities. AuthorizationsCollector.canDoOperation substitutes unescaped client IDs or usernames into %c or %u ACL rules and evaluates the result as a topic filter. Pattern-based ACLs must be configured; + broadens topic access, while # can also interrupt session processing through a Topic.match null-pointer exception.

CVSS severity9.6
Critical
EPSS probability0.27%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authorization bypass in Moquette 0.18.0 and earlier allows remote attackers to read and write cross-tenant MQTT topics via crafted identities. AuthorizationsCollector.canDoOperation substitutes unescaped client IDs or usernames into %c or %u ACL rules and evaluates the result as a topic filter. Pattern-based ACLs must be configured; + broadens topic access, while # can also interrupt session processing through a Topic.match null-pointer exception.

The record

CVE
CVE-2026-85724
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
Moquette
Product
Moquette
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.18.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moquette · Moquetteversion=< 0.18.1

Published CVSS scores

9.6GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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