by Kastro
Paper/Archive/CVE-2026-85724

CVE-2026-85724

moquette-io moquette — Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass

EPSS 0.3%public exploitCVSS 9.6
critical.is priorityof 100
44
CVSS 9.6 (CNA)9.6 / 10 × 3028.8Not in CISA KEV+300.0EPSS percentile 24.5.245 × 204.9Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
moquette< 0.18.1–CNA

Scores by source

GitHub_M (CNA)9.6CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhqrefgithub.com/moquette-io/moquette/commit/b4a98bb3f3425ece476ed073aa080c627c1239afrefgithub.com/moquette-io/moquette/releases/tag/v0.18.1