ModelTC LightLLM up to 1.2.0 WebSocket Endpoint /pd_register improper authentication

Summaryinfo

A vulnerability, which was classified as critical, was found in ModelTC LightLLM up to 1.2.0. This affects an unknown part of the file /pd_register of the component WebSocket Endpoint. Executing a manipulation can lead to improper authentication. The identification of this vulnerability is CVE-2026-93839. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in ModelTC LightLLM up to 1.2.0 and classified as critical. This vulnerability affects some unknown functionality of the file /pd_register of the component WebSocket Endpoint. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

LightLLM through 1.2.0 contains an authentication bypass vulnerability in the /pd_register WebSocket endpoint that allows unauthenticated attackers to register arbitrary nodes by supplying crafted JSON without peer address validation. Attackers can disclose full user prompts routed to their socket, trigger denial of service by replacing legitimate nodes, or make the PD Master issue requests to internal network addresses.

The advisory is available at github.com. This vulnerability was named CVE-2026-93839 since 09/18/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. 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 09/18/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• ModelTC

Name

• LightLLM

Version

• 1.0
• 1.1
• 1.2.0

Website

• Product: https://github.com/ModelTC/LightLLM/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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