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Fencer Intel
critical 9.6

CVE-2026-85724 json

Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass

published last mo. modified 23d ago also CVE-2026-95842 , CVE-2026-95843 , CVE-2026-95844 , CVE-2026-95845 , CVE-2026-95846 , CVE-2026-95847 , CVE-2026-95848 , GHSA-5f42-97gr-vfhq , EUVD-2026-85411

cvss
9.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits
0
none known

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.

Patch / fix

  • maven io.moquette:moquette-broker 0.18.1
  • moquette moquette 0.18.1

Is CVE-2026-85724 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
last mo.

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
GitHub 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven io.moquette:moquette-broker
<0.18.1
0.18.1

Affected products

  • moquette-io moquette

Classification

Weakness
  • CWE-863 Incorrect Authorization
  • CWE-155 Improper Neutralization of Wildcards or Matching Symbols

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.