CVE-2026-95848 Moquette fails open when configured authentication or authorization classes cannot load
Moquette MQTT broker fails open to allow all access if configured authentication or authorization classes fail to load, bypassing security controls.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-95848?
CVE-2026-95848 is a critical authentication bypass vulnerability in moquette-io moquette, published on 23 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, when a configured authenticator or authorizator class cannot be loaded, Server.initializeAuthenticator and Server.initializeAuthorizatorPolicy treat the failure as though no custom class was configured and fall back to AcceptAllAuthenticator or PermitAllAuthorizatorPolicy. A misspelled class name, missing dependency, constructor failure, or classpath problem can therefore start the broker with authentication or authorization disabled even though the operator configured those controls. This issue is fixed in version 0.18.1.
Weakness: CWE-636
Which versions are affected by CVE-2026-95848?
It affects 1 product.
Products include Moquette Moquette.
How do I fix CVE-2026-95848?
No fix has been published for CVE-2026-95848 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-95848 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-95848 exists.
Other vulnerabilities in moquette-io moquette
- CVE-2026-85724 Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass
- CVE-2026-95847 Moquette client IDs can cause cross-session H2 durable-queue corruption
- CVE-2026-95842 Moquette uncaught MQTT command exceptions can terminate shared session event loops
- CVE-2026-95843 Moquette malformed shared subscriptions can crash command processing
- CVE-2026-95844 Moquette deeply nested MQTT topics can cause stack exhaustion