Shenzhen Cudy TR3000 up to 2.5.41 Mosquitto plugin auth_plugin_jwt.so improper authentication

Summaryinfo

A vulnerability classified as very critical was found in Shenzhen Cudy TR3000 up to 2.5.41. The affected element is an unknown function of the file auth_plugin_jwt.so of the component Mosquitto plugin. The manipulation results in improper authentication. This vulnerability is identified as CVE-2026-75491. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Shenzhen Cudy TR3000 up to 2.5.41. Affected is an unknown function of the file auth_plugin_jwt.so of the component Mosquitto plugin. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Cudy TR3000 before 2.5.42 contains an authentication bypass vulnerability in the Mosquitto plugin auth_plugin_jwt.so that accepts unsigned JWTs using alg none. Attackers holding any Cudy-trusted client certificate can authenticate as admincudydevice on port 8883 and publish batchcmd requests to execute commands as root.

The advisory is available at cudy.com. This vulnerability is traded as CVE-2026-75491 since 08/17/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/13/2026).

Upgrading to version 2.5.42 eliminates this vulnerability.

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Productinfo

Vendor

• Shenzhen Cudy

Name

• TR3000

Version

• 2.5.0
• 2.5.1
• 2.5.2
• 2.5.3
• 2.5.4
• 2.5.5
• 2.5.6
• 2.5.7
• 2.5.8
• 2.5.9
• 2.5.10
• 2.5.11
• 2.5.12
• 2.5.13
• 2.5.14
• 2.5.15
• 2.5.16
• 2.5.17
• 2.5.18
• 2.5.19
• 2.5.20
• 2.5.21
• 2.5.22
• 2.5.23
• 2.5.24
• 2.5.25
• 2.5.26
• 2.5.27
• 2.5.28
• 2.5.29
• 2.5.30
• 2.5.31
• 2.5.32
• 2.5.33
• 2.5.34
• 2.5.35
• 2.5.36
• 2.5.37
• 2.5.38
• 2.5.39
• 2.5.40
• 2.5.41

CPE 2.3info

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