CVE-2026-95848: moquette — Exploit & Fix

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.

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CVSS v3.1 Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS — Exploit Prediction

0.0042

Probability of exploitation

0.36%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-636 CWE-636

Affected Products

Vendor	Product	Versions
moquette	moquette	< 0.18.1

References

Advisories & Patches

https://github.com/moquette-io/moquette/commit/14a2f4fd280c8f6a791600c306cbccecb7c67007 https://github.com/moquette-io/moquette/pull/967 https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq

Exploits

https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq

Other References

https://github.com/moquette-io/moquette/releases/tag/v0.18.1

Frequently Asked Questions

What is CVE-2026-95848? +

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. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-95848? +

CVE-2026-95848 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0042, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-95848? +

CVE-2026-95848 affects products from moquette, specifically: moquette. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-95848? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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