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CVE-2026-93839— LightLLM through 1.2.0 Missing Authentication in PD Master /pd_register WebSocket Endpoint

Quick assessment

Affected
ModelTC LightLLM
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LightLLM 1.2.0 及更早版本中存在一个身份验证绕过漏洞，位于 WebSocket 端点。未经身份验证的攻击者可以通过提供精心构造的 JSON 数据（且无需进行对端地址验证）来注册任意节点。攻击者可以利用该漏洞： 1. 获取被路由到其 socket 的完整用户提示词（prompts）； 2. 通过替换合法节点引发拒绝服务（DoS）； 3. 诱导 PD Master 向内部网络地址发起请求，从而可能进一步攻击内部网络。

CVSS 9.8 · Critical

Affected Version Matrix 1

VendorProduct Version RangeStatus
ModelTC LightLLM ≤ 1.2.0 affected
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I. Basic Information for CVE-2026-93839

Vulnerability Information
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Vulnerability Title
LightLLM through 1.2.0 Missing Authentication in PD Master /pd_register WebSocket Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ModelTC LightLLM 0 ~ 1.2.0 -

II. Public POCs for CVE-2026-93839

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III. Intelligence Information for CVE-2026-93839

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Vendor Advisories for CVE-2026-93839 (1)

Other References for CVE-2026-93839 (5)

IV. Related Vulnerabilities

Same product: LightLLM
Same vendor: ModelTC
Same weakness: CWE-306

V. Comments for CVE-2026-93839

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